📊 What is Microsoft Excel?

Microsoft Excel is a spreadsheet application used to organise, calculate, analyse and present data.

Excel stores information in a worksheet made up of rows and columns.

Advanced Excel features help users work with large amounts of data quickly and accurately.

📘 Workbook and Worksheet

A workbook is an Excel file that can contain one or more worksheets.

A worksheet is a single spreadsheet page inside a workbook.

Each worksheet contains rows, columns and cells.

📍 Cell References

Every cell in a worksheet has a unique address called a cell reference.

A cell reference is formed using the column letter and row number.

Examples:

• A1
• B5
• C10
• D25

🔄 Relative Cell Reference

A relative cell reference changes automatically when a formula is copied to another cell.

Example:

=A2+B2

If this formula is copied one row down, it changes to:

=A3+B3

📌 Absolute Cell Reference

An absolute cell reference remains fixed when a formula is copied to another cell.

The $ symbol is used to make a reference absolute.

Example:

=$A$1

The row and column remain fixed when the formula is copied.

🔀 Mixed Cell Reference

A mixed cell reference has either the row or the column fixed.

Examples:

• $A1 — Column A is fixed.
• A$1 — Row 1 is fixed.

🔤 Sorting Data

Sorting means arranging data in a particular order.

Data can be sorted in:

• Ascending order
• Descending order
• Alphabetical order
• Numerical order
• Date order

🔍 Filtering Data

Filtering is used to display only the data that matches specific conditions.

Filtering temporarily hides data that does not match the selected condition.

Example:

A teacher can filter a student list to display only students who scored more than 80 marks.

🎨 Conditional Formatting

Conditional Formatting automatically changes the appearance of cells when specified conditions are met.

It can be used to highlight:

• High marks
• Low marks
• Duplicate values
• Important dates
• Specific ranges of values

✅ Data Validation

Data Validation controls the type of data that can be entered into a cell.

It helps prevent incorrect or unwanted data entry.

Examples:

• Allow marks only between 0 and 100.
• Allow dates only within a selected range.
• Create a list of predefined options.

📋 Creating a Drop-down List

A drop-down list allows the user to select a value from a predefined list.

Drop-down lists are commonly created using Data Validation.

Example:

Present
Absent
Leave

A teacher can select one of these options for each student.

🔎 Find and Replace

The Find feature helps locate specific text, numbers or values in a worksheet.

The Replace feature replaces one value with another value.

Example:

Find Class VII-A and replace it with Grade VII-A.

❄️ Freeze Panes

Freeze Panes keeps selected rows or columns visible while scrolling through a worksheet.

This feature is useful when working with large tables.

Example:

The heading row can remain visible while scrolling down through a long list of students.

🎨 What is GIMP?

GIMP stands for GNU Image Manipulation Program.

It is an image-editing and graphics program used to create, edit and improve digital images.

GIMP provides many tools for drawing, painting, selecting, transforming and enhancing images.

🖼️ What is Image Editing?

Image editing is the process of changing or improving a digital image using software tools.

We can edit an image by:

• Changing its size
• Removing unwanted parts
• Adjusting colours
• Adding text
• Combining images
• Applying filters and effects

🖥️ The GIMP Interface

The GIMP window contains different areas that help us work with an image.

• Toolbox — Contains editing tools.
• Image Window — Displays the image.
• Tool Options — Shows settings for the selected tool.
• Layers Panel — Displays the layers of an image.
• Menu Bar — Contains commands and options.

📚 Understanding Layers

A layer is like a transparent sheet placed over other sheets to create a complete image.

Different parts of an image can be placed on separate layers.

This allows us to edit one part of an image without changing the other parts.

🗂️ Working with Layers

In GIMP, we can perform several operations on layers.

• Create a new layer
• Delete a layer
• Rename a layer
• Duplicate a layer
• Change the order of layers
• Hide or show a layer
• Change layer opacity

⬆️⬇️ Layer Order

The position of a layer in the Layers Panel affects how the final image appears.

A layer placed above another layer may cover parts of the layer below it.

Layers can be moved up or down to change their order.

🌫️ Layer Opacity

Opacity controls how transparent or solid a layer appears.

A higher opacity makes the layer more visible, while a lower opacity makes it more transparent.

🔲 What is a Selection?

A selection is a selected part of an image on which editing operations can be performed.

When an area is selected, changes usually affect only the selected part.

Selections are useful for editing specific portions of an image.

▭ Rectangle Select Tool

The Rectangle Select Tool is used to select a rectangular area of an image.

The selected area can then be copied, deleted, moved or edited.

⭕ Ellipse Select Tool

The Ellipse Select Tool is used to select a circular or oval-shaped area.

It is useful when editing round objects or creating circular designs.

✏️ Free Select Tool

The Free Select Tool allows us to select an irregular area of an image.

It is useful when the required selection does not have a simple rectangular or circular shape.

✂️ Crop Tool

The Crop Tool is used to remove unwanted outer areas from an image.

Cropping helps focus attention on the important part of an image.

📐 Scale Tool

The Scale Tool is used to change the size of an image or layer.

An image can be enlarged or reduced according to the required dimensions.

🔄 Rotate Tool

The Rotate Tool is used to rotate an image or layer around a selected point.

It can be used to turn an object in a clockwise or anticlockwise direction.

↔️ Flip Tool

The Flip Tool creates a mirror image of an image or layer.

An object can be flipped:

• Horizontally
• Vertically

✋ Move Tool

The Move Tool is used to change the position of a layer, selection or object.

It helps us arrange different objects correctly in a design.

🔤 Adding Text

The Text Tool is used to add text to an image.

We can change different properties of text, such as:

• Font
• Font size
• Text colour
• Alignment

🖌️ Painting Tools

GIMP provides tools for drawing and painting on an image.

• Paintbrush Tool — Paints with a brush.
• Pencil Tool — Draws hard-edged lines.
• Eraser Tool — Removes parts of an image.
• Bucket Fill Tool — Fills an area with colour.

👣 What is a Digital Footprint?

A digital footprint is the trail of information and activities that a person leaves behind while using the internet and digital devices.

Every time we perform an online activity, such as visiting a website, searching for information or posting content, we may create part of our digital footprint.

A digital footprint can help form an online record of our activities and presence.

🌐 How is a Digital Footprint Created?

A digital footprint can be created through many online activities.

• Visiting websites
• Searching on the internet
• Creating online accounts
• Posting photographs or videos
• Writing comments
• Sending messages or emails
• Downloading applications
• Playing online games

✍️ Active Digital Footprint

An active digital footprint is created when a person knowingly shares information or performs an action online.

Examples:

• Creating a social media post
• Uploading a photograph
• Writing a comment
• Filling out an online form
• Sending an email
• Creating an online profile

🔍 Passive Digital Footprint

A passive digital footprint may be created when information about a person's online activity is collected without the person actively entering or publishing that information.

Examples may include:

• Website browsing information
• Device information
• Cookies stored by websites
• Approximate location information
• Online activity records

⚖️ Active vs Passive Footprints

The main difference is whether information is deliberately shared by the user or collected as part of digital activity.

🪪 Online Identity

An online identity is the way a person is represented on the internet.

It may include information such as:

• Name or username
• Profile picture
• Posts and comments
• Achievements
• Shared photographs and videos
• Online profiles

⭐ Digital Reputation

A digital reputation is the impression that people may form about a person based on information available about them online.

Responsible and respectful online behaviour can help build a positive digital reputation.

💡 Why Do Digital Footprints Matter?

Information shared online can sometimes remain available for a long time and may be copied, shared or stored by others.

Therefore, it is important to think carefully before sharing information online.

A digital footprint can influence a person's privacy, safety and online reputation.

🔐 Protecting Personal Information

Personal information is information that may identify or describe a person.

Some information should not be shared publicly or with unknown people online.

Examples include:

• Home address
• Phone number
• Passwords
• Banking information
• Important identity documents
• Private photographs or personal details

🤔 Think Before You Post

Before posting something online, stop and think about its possible effects.

Ask yourself:

• Is this information safe to share?
• Is the information true and appropriate?
• Could this hurt or embarrass someone?
• Would I be comfortable if others saw this later?
• Do I have permission to share it?

📷 Sharing Photos and Videos

Photos and videos can become part of a person's digital footprint when they are shared online.

Before sharing an image or video, it is important to consider privacy and obtain permission where appropriate.

• Ask before posting someone else's photograph.
• Do not share private images without permission.
• Check what information is visible in the background.
• Use privacy settings carefully.

🤝 Responsible Online Behaviour

The same values of good behaviour should be followed online as in the real world.

A responsible digital citizen should:

• Be respectful and polite.
• Avoid cyberbullying.
• Respect other people's privacy.
• Use appropriate language.
• Report harmful or suspicious content.
• Follow rules and guidelines.

🔑 Password Safety

Passwords help protect online accounts and personal information.

A strong password should be difficult for others to guess.

• Do not share your password.
• Avoid using obvious personal information.
• Use a unique password for important accounts.
• Use a mixture of characters where appropriate.
• Log out from shared or public devices.

🍪 What are Cookies?

A cookie is a small piece of information that a website can store in a browser or device to help remember certain information or preferences.

Cookies can be used for useful purposes such as remembering login sessions or website preferences.

Users should understand and review privacy and cookie settings when using online services.

⚙️ Privacy Settings

Many websites and applications provide privacy settings that allow users to control who can see or access certain information.

Privacy settings should be checked carefully, especially before sharing personal information online.

⏳ Information Can Remain Online

Content posted online can sometimes be copied, downloaded, forwarded or captured by other people.

Deleting a post may not always remove every copy that has already been shared or saved elsewhere.

This is why responsible sharing is important.

📱 What is an App?

An app, short for application, is a software program designed to perform a specific task or provide a particular service.

Apps can be used on smartphones, tablets, computers, smart TVs and other digital devices.

Examples of app activities include communication, learning, gaming, shopping, navigation and entertainment.

🗂️ Types of Applications

Applications can be developed for different purposes.

• 📚 Educational apps
• 🎮 Gaming apps
• 💬 Communication apps
• 🗺️ Navigation apps
• 🛒 Shopping apps
• 🎵 Entertainment apps
• 🏥 Health and fitness apps
• 🏦 Banking apps

📲 What is a Mobile App?

A mobile app is an application designed to run mainly on mobile devices such as smartphones and tablets.

Mobile apps are usually designed to work with features available on a device, such as the touchscreen, camera, microphone, speaker and sensors.

🛠️ What is App Development?

App development is the process of planning, designing, creating, testing and improving an application.

An app developer combines creativity, problem-solving and programming to build useful applications.

🔄 Steps in App Development

1. Identify a problem — Decide what problem the app will solve.
2. Plan — Decide the features and functions.
3. Design — Plan the screens and appearance.
4. Develop — Create the app and write its logic.
5. Test — Find and correct errors.
6. Improve — Add useful changes based on feedback.

🖥️ What is a User Interface?

A User Interface (UI) is the part of an application through which a user interacts with the app.

A mobile app interface may contain:

• Buttons
• Labels
• Text boxes
• Images
• Menus
• Icons
• Sliders

😊 What is User Experience?

User Experience (UX) refers to how easy, clear and pleasant an application is for a person to use.

A good app should be easy to understand and should help users complete their tasks without unnecessary difficulty.

🧩 App Components

Applications are made using different components.

A component is a part of an app that performs a specific function.

• Label — Displays text.
• Button — Performs an action when clicked.
• Text Box — Accepts text from the user.
• Image — Displays a picture or graphic.
• Sound — Plays audio.
• Sensor — Collects information from the device or environment.

📥 Input in an App

Input is the information given to an app by a user or another device component.

Examples of input include:

• Typing text
• Clicking a button
• Touching the screen
• Speaking into a microphone
• Using the camera
• Receiving information from a sensor

⚙️ Processing

Processing is the work performed by the application on the input or data it receives.

The app follows programmed instructions to decide what should happen next.

📤 Output in an App

Output is the result or response produced by an application.

Examples include:

• Displaying a message
• Showing an image
• Playing a sound
• Displaying a calculation result
• Opening another screen

🔄 Input → Process → Output

Many applications follow the Input → Process → Output model.

For example:

User enters two numbers → App adds them → App displays the answer

⚡ What is an Event?

An event is an action or occurrence that can cause an application to perform a task.

Common events include:

• Clicking a button
• Touching the screen
• Typing text
• Opening an app
• Changing the value of a component

🔔 Event-Driven Programming

Many modern applications use event-driven programming.

In this type of programming, the app waits for an event and then performs the instructions connected with that event.

For example, when a user clicks a button, the app performs the instructions assigned to that button.

🧱 Block-Based App Development

Beginners can create applications using block-based programming.

Instead of writing every instruction as text, programmers join visual blocks to create the logic of an application.

Block-based development can help students understand programming concepts such as events, conditions and repetition.

📄 App Screens

An app may contain one or more screens.

Each screen can be designed for a particular purpose.

Example:

• Home Screen
• Login Screen
• Profile Screen
• Settings Screen
• Result Screen

🧠 App Logic

App logic is the set of instructions that controls how an application behaves.

The logic determines what happens when users perform different actions.

Example:

If the user enters the correct answer, the app displays "Correct!". Otherwise, it displays "Try Again!".

🌐 What is a Website?

A website is a collection of related web pages that can be accessed through the internet.

Websites can provide information, services, entertainment, education, communication and many other सुविधाएँ.

Examples of websites include educational websites, news websites, shopping websites and personal websites.

📄 What is a Webpage?

A webpage is a single document that is viewed using a web browser.

A webpage may contain text, images, videos, links, tables, buttons and other interactive elements.

Multiple related webpages can together form a website.

⚖️ Website vs Webpage

💻 What is Web Development?

Web development is the process of creating, designing and maintaining websites and web applications.

A web developer uses different technologies to create webpages that can be viewed and used through a web browser.

🧱 What is HTML?

HTML stands for HyperText Markup Language.

HTML is used to create the basic structure and content of a webpage.

HTML can be used to add:

• Headings
• Paragraphs
• Images
• Links
• Lists
• Tables
• Forms

🏷️ HTML is a Markup Language

HTML is called a markup language because it uses special elements and tags to describe the structure of content on a webpage.

HTML tells the web browser what different parts of the content represent.

🏷️ What is an HTML Tag?

An HTML tag is a special keyword written inside angle brackets.

Many HTML elements use an opening tag and a closing tag.

Example:

<p>This is a paragraph.</p>

In this example, <p> is the opening tag and </p> is the closing tag.

🧩 What is an HTML Element?

An HTML element usually consists of an opening tag, content and a closing tag.

<tag>Content</tag>

For example:

<h1>My First Website</h1>

📄 Basic Structure of an HTML Document

A basic HTML webpage follows a standard structure.

<!DOCTYPE html>
<html>

<head>
    <title>My First Webpage</title>
</head>

<body>
    <h1>Welcome!</h1>
    <p>This is my first webpage.</p>
</body>

</html>

🌍 The <html> Element

The <html> element represents the main document of a webpage.

Most of the HTML content of a webpage is placed inside the opening and closing <html> tags.

🧠 The <head> Section

The <head> section contains information about the webpage.

Information in the head section can include:

• Title of the webpage
• Links to CSS files
• Information for the browser

🔖 The <title> Element

The <title> element specifies the title of a webpage.

The title is commonly displayed in the browser tab.

<title>My School Website</title>

📦 The <body> Section

The <body> section contains the visible content of a webpage.

Text, headings, images, links and other elements that users see are generally placed inside the <body>.

🔤 HTML Headings

HTML provides six levels of headings: <h1> to <h6>.

<h1> generally represents the most important heading, while <h6> represents the least important heading.

<h1>Main Heading</h1>
<h2>Subheading</h2>
<h3>Smaller Heading</h3>

📝 Paragraphs

The <p> tag is used to create a paragraph.

<p>
    Computers make our work easier.
</p>

↩️ Line Break

The <br> tag is used to insert a line break.

Hello<br>
Welcome to my webpage!

➖ Horizontal Rule

The <hr> tag is used to create a horizontal line that can separate sections of content.

<hr>

📋 HTML Lists

HTML can be used to create different types of lists.

• Ordered List — Displays items in order.
• Unordered List — Displays items using bullets.

🔢 Ordered List

The <ol> tag creates an ordered list, and the <li> tag defines each list item.

<ol>
    <li>HTML</li>
    <li>CSS</li>
    <li>JavaScript</li>
</ol>

• Unordered List

The <ul> tag creates an unordered list.

<ul>
    <li>Keyboard</li>
    <li>Mouse</li>
    <li>Monitor</li>
</ul>

🔗 Hyperlinks

A hyperlink connects one webpage or resource to another.

The <a> tag is used to create a link.

<a href="https://example.com">
    Visit Example
</a>

🖼️ Adding Images

The <img> tag is used to display an image on a webpage.

<img src="image.jpg"
     alt="A beautiful image">

The src attribute specifies the image location, while alt provides alternative text describing the image.

⚙️ What are Attributes?

Attributes provide additional information about an HTML element.

Attributes are generally written inside the opening tag.

<a href="page.html">Open Page</a>

In this example, href is an attribute.

🎨 What is CSS?

CSS stands for Cascading Style Sheets.

CSS is used to control the appearance and presentation of HTML elements.

CSS can be used to change:

• Colours
• Fonts
• Text size
• Backgrounds
• Borders
• Spacing
• Layout

⚖️ HTML vs CSS

HTML and CSS work together to create webpages.

🧩 Basic CSS Syntax

A CSS rule contains a selector and one or more declarations.

p {
    color: blue;
}

In this example:

• p is the selector.
• color is the property.
• blue is the value.

🎯 CSS Selector

A selector tells CSS which HTML element or elements should be styled.

h1 {
    color: red;
}

This rule selects all <h1> headings.

🖌️ CSS Properties

A CSS property specifies what aspect of an element should be styled.

Common properties include:

• color
• background-color
• font-size
• font-family
• text-align
• border

🛠️ Ways to Apply CSS

CSS can be applied to an HTML document in different ways.

• Inline CSS
• Internal CSS
• External CSS

✏️ Inline CSS

Inline CSS is written directly inside an HTML element using the style attribute.

<p style="color: blue;">
    Hello!
</p>

📄 Internal CSS

Internal CSS is written inside a <style> element, usually within the <head> section.

<style>
    h1 {
        color: green;
    }
</style>

🔗 External CSS

External CSS is stored in a separate file, usually with a .css extension.

The CSS file can be connected to an HTML document using the <link> element.

<link rel="stylesheet"
      href="style.css">

🎨 Revisiting CSS

CSS stands for Cascading Style Sheets.

CSS is used to control the appearance and presentation of HTML elements on a webpage.

With CSS, we can change colours, fonts, sizes, spacing, borders, backgrounds and the arrangement of elements.

🧩 CSS Rule Structure

A CSS rule usually contains a selector and one or more declarations.

selector {
    property: value;
}

Example:

p {
    color: blue;
}

• p is the selector.
• color is the property.
• blue is the value.

📋 Multiple CSS Properties

Multiple properties can be used inside the same CSS rule.

h1 {
    color: blue;
    font-size: 36px;
    text-align: center;
}

Each declaration should be written on a separate line or separated using a semicolon.

🌈 Text Colours

The color property is used to change the colour of text.

p {
    color: green;
}

Colours can make important information easier to identify. However, too many colours can make a webpage difficult to read.

🖌️ Background Colours

The background-color property is used to change the background colour of an element.

body {
    background-color: lightblue;
}

Background colours can be applied to the entire webpage or to individual elements.

🎨 Ways to Specify Colours

CSS allows colours to be specified in different ways.

• Colour names
• HEX colour values
• RGB colour values

color: red;

color: #ff0000;

color: rgb(255, 0, 0);

🔤 Font Family

The font-family property is used to specify the typeface of text.

p {
    font-family: Arial;
}

A webpage should use fonts that are clear and easy to read.

🔠 Font Size

The font-size property is used to change the size of text.

p {
    font-size: 20px;
}

The unit px means pixels.

💪 Font Weight

The font-weight property controls the thickness of text.

p {
    font-weight: bold;
}

Common values include normal and bold.

✍️ Font Style

The font-style property can change the style of text.

p {
    font-style: italic;
}

↔️ Text Alignment

The text-align property controls the horizontal alignment of text.

h1 {
    text-align: center;
}

Common values include:

• left
• center
• right

➖ Text Decoration

The text-decoration property is used to add or remove decorations from text.

h1 {
    text-decoration: underline;
}

It can also be used to remove the default underline from links.

a {
    text-decoration: none;
}

🔲 Borders

The border property is used to add a border around an element.

p {
    border: 2px solid black;
}

A border can have different widths, styles and colours.

⭕ Rounded Corners

The border-radius property is used to create rounded corners.

div {
    border: 2px solid blue;
    border-radius: 10px;
}

📏 Width and Height

The width and height properties control the dimensions of an element.

div {
    width: 300px;
    height: 150px;
}

📦 Padding

Padding is the space between the content of an element and its border.

div {
    padding: 20px;
}

↔️ Margin

Margin is the space outside an element's border.

div {
    margin: 20px;
}

📦 The CSS Box Model

CSS treats many HTML elements as rectangular boxes.

The basic CSS box model consists of:

1. Content
2. Padding
3. Border
4. Margin

These properties help control the size and spacing of webpage elements.

🏷️ Class Selectors

A class can be used to apply the same CSS style to multiple HTML elements.

HTML:

<p class="important">
    Important Information
</p>

CSS:

.important {
    color: red;
    font-weight: bold;
}

A class selector begins with a full stop (.).

🆔 ID Selectors

An id can be used to identify a particular HTML element.

HTML:

<h1 id="main-title">
    My Website
</h1>

CSS:

#main-title {
    color: purple;
}

An ID selector begins with a hash symbol (#).

👥 Grouping Selectors

Multiple selectors can be grouped together when they use the same styles.

h1, h2, h3 {
    color: blue;
}

This helps reduce repeated CSS code.

🔗 Styling Links

CSS can be used to change the appearance of hyperlinks.

a {
    color: green;
    text-decoration: none;
}

🖼️ Styling Images

CSS can be used to control the size and appearance of images.

img {
    width: 200px;
    border: 2px solid black;
    border-radius: 10px;
}

🔘 Styling Buttons

CSS can make buttons more attractive and easier to use.

button {
    background-color: blue;
    color: white;
    padding: 10px;
    border: none;
    border-radius: 5px;
}

🐍 Revisiting Python

Python is a popular programming language used to create computer programs, websites, games, applications, artificial intelligence systems and many other digital solutions.

Python is known for its simple and readable syntax, which makes it a useful language for beginners.

💻 What is a Program?

A program is a set of instructions written to make a computer perform a task.

A Python program is made up of statements that are executed by the Python interpreter.

print("Hello, World!")

📄 Python Statements

An instruction written in a programming language is often called a statement.

name = "Ananya"
print(name)

Python generally executes statements in the order in which they are written, unless instructions such as conditions or loops change the flow of the program.

📦 Variables

A variable is a named location used to store data in a program.

name = "Riya"
age = 12
marks = 95

The values stored in variables can be used later in the program.

🔄 Updating a Variable

The value stored in a variable can be changed.

score = 10
score = 20

print(score)

The program displays the latest value stored in the variable.

⌨️ Taking Input

The input() function is used to accept information from the user.

name = input("Enter your name: ")

print("Hello", name)

The user's response can be stored in a variable.

🔢 Type Conversion

Data received through input() is generally treated as text. When numerical input is required, type conversion may be used.

age = int(input("Enter your age: "))

print(age)

Common conversion functions include:

• int() — Converts a value to an integer.
• float() — Converts a value to a decimal number.
• str() — Converts a value to text.

➕ Operators in Python

Operators are symbols or keywords used to perform operations on values.

Python uses different types of operators, including:

• Arithmetic operators
• Comparison operators
• Logical operators

🧮 Arithmetic Operators

Arithmetic operators are used to perform mathematical calculations.

a = 10
b = 3

print(a + b)
print(a - b)
print(a * b)
print(a / b)

⚖️ Comparison Operators

Comparison operators compare two values and produce either True or False.

marks = 85

print(marks > 50)

Common comparison operators include:

• == Equal to
• != Not equal to
• > Greater than
• < Less than
• >= Greater than or equal to
• <= Less than or equal to

🔘 Boolean Values

A Boolean value can have one of two values:

• True
• False

print(10 > 5)
print(10 < 5)

Boolean values are useful when a program needs to make decisions.

🤔 Decision-Making in Python

Sometimes a program must choose between different actions.

Python uses conditional statements to make decisions based on whether a condition is True or False.

🚦 The if Statement

The if statement executes a block of code only when a condition is true.

marks = 75

if marks >= 40:
    print("You have passed.")

Notice the colon (:) and the indentation before the print() statement.

📐 Indentation

Indentation means leaving spaces at the beginning of a line of code.

Python uses indentation to identify which statements belong to a particular block.

if age >= 18:
    print("Eligible")

Incorrect indentation can cause an error.

🔀 The if...else Statement

The else statement provides an alternative action when the condition is false.

marks = 35

if marks >= 40:
    print("Pass")
else:
    print("Try again")

🚥 The if...elif...else Statement

The elif statement can be used to check additional conditions.

marks = 78

if marks >= 90:
    print("Excellent")
elif marks >= 60:
    print("Good")
else:
    print("Keep practising")

🔁 What is a Loop?

A loop is used to repeat a set of instructions.

Loops help programmers avoid writing the same instructions again and again.

🔄 The for Loop

A for loop is commonly used when a task needs to be repeated a known number of times.

for number in range(5):
    print(number)

This loop displays numbers from 0 to 4.

🔢 The range() Function

The range() function is often used with a for loop.

for number in range(1, 6):
    print(number)

This displays:

1
2
3
4
5

🔁 The while Loop

A while loop repeats instructions while a condition remains true.

number = 1

while number <= 5:
    print(number)
    number = number + 1

♾️ Avoiding Infinite Loops

An infinite loop is a loop that continues running because its condition never becomes false.

When using a while loop, ensure that the variables involved in the condition are updated correctly.

🔤 Strings

A string is a sequence of characters used to represent text.

name = "Python"
message = "Welcome to programming!"

Strings are written inside quotation marks.

🔗 Joining Strings

Two or more strings can be joined together using the + operator.

first_name = "Aman"
last_name = "Sharma"

full_name = first_name + " " + last_name

print(full_name)

📏 Finding String Length

The len() function can be used to find the number of characters in a string.

name = "Python"

print(len(name))

📋 Introduction to Lists

A list is used to store multiple values in a single variable.

subjects = [
    "English",
    "Mathematics",
    "Science",
    "Computer"
]

Lists are written using square brackets ([ ]).

🔍 Accessing List Items

Each item in a list has a position called an index.

Python list indexing begins at 0.

subjects = [
    "English",
    "Maths",
    "Science"
]

print(subjects[0])

The output is:

English

➕ Adding an Item to a List

The append() method adds an item to the end of a list.

fruits = ["Apple", "Banana"]

fruits.append("Mango")

print(fruits)

🔄 Looping Through a List

A for loop can be used to process each item in a list.

fruits = [
    "Apple",
    "Banana",
    "Mango"
]

for fruit in fruits:
    print(fruit)

🐞 Finding and Fixing Errors

The process of finding and correcting errors in a program is called debugging.

Common programming errors include:

• Syntax errors
• Logical errors
• Runtime errors

💬 Comments in Python

A comment is a note written in a program to explain the code.

Python ignores comments while executing the program.

# This program displays a message

print("Hello!")

👁️ What is Computer Vision?

Computer Vision is a field of technology that enables computers and machines to capture, process and understand information from images and videos.

Just as human eyes collect visual information and the brain helps us understand what we see, a computer vision system uses a camera and a computer program to analyse visual information.

🧠 Human Vision and Computer Vision

Humans use their eyes and brain to recognise objects, people, colours and movement.

Computers use cameras, sensors, data and algorithms to process visual information.

📷 The Role of a Camera

A camera acts as an input device for many computer vision systems.

It captures photographs or a sequence of images called video frames.

These images can then be processed by a computer program.

🖼️ What is a Digital Image?

A digital image is an image stored in a form that a computer can process.

Digital images are made up of many tiny dots called pixels.

Each pixel contains colour information.

🔲 Understanding Pixels

A pixel is the smallest individual element of a digital image.

When many pixels are placed together, they form a complete picture.

More pixels can provide more visual detail, depending on the quality of the image and the display.

🌈 Colours in Digital Images

Many digital displays and images represent colours using combinations of:

• 🔴 Red
• 🟢 Green
• 🔵 Blue

This colour model is called RGB.

⚙️ Image Processing

Image processing involves changing or analysing a digital image using a computer.

Examples include:

• Changing brightness
• Changing contrast
• Resizing an image
• Applying filters
• Detecting edges

🔍 Image Analysis

Image analysis involves examining an image to find useful information.

A computer vision system may try to answer questions such as:

• Is there a person in the image?
• Where is the object?
• What colour is the object?
• How many objects are present?

🤖 Computer Vision and AI

Artificial Intelligence (AI) can help computer vision systems recognise patterns and make predictions based on visual data.

For example, an AI system can be trained using many labelled images to learn visual patterns associated with different categories of objects.

📚 Training Data

AI systems often learn from examples. A collection of images used for learning is called a dataset.

For example, an object-recognition system may learn from many example images with information describing what they contain.

🏷️ Image Classification

Image classification is the task of assigning an image to a category.

For example, a system might classify an image as:

• Cat
• Dog
• Car
• Tree

📦 Object Detection

Object detection identifies objects and can also determine their approximate locations in an image.

A system may detect multiple objects in one picture, such as people, vehicles and traffic signs.

🙂 Face Detection

Face detection is used to determine whether a human face is present in an image or video.

It can be used in applications such as camera autofocus, photo organisation and video effects.

🎯 Object Tracking

In a video, objects can move from one frame to another.

Object tracking involves following the movement of an object across multiple frames.

This can be useful in robotics, sports analysis and traffic monitoring.

🏃 Motion Detection

A computer vision system can compare visual information over time to detect changes in a scene.

This is commonly called motion detection.

Motion detection can be used in security and automation systems.

🔤 Recognising Text

Optical Character Recognition (OCR) is a technology used to identify and convert visible printed or handwritten text into digital text.

OCR can help digitise documents and make text searchable.

🔳 Reading QR Codes

Cameras and computer programs can analyse special visual patterns such as QR codes.

A QR code can store information that can be decoded by a suitable scanner or application.

🔄 How Computer Vision Works

A simple computer vision process can be understood as:

Capture → Process → Analyse → Recognise → Respond

A camera captures visual data, software processes it and the system uses the results to make a decision or perform an action.

🤖 Computer Vision in Robotics

Computer vision can give robots information about their surroundings.

A robot with a camera may be able to detect objects, follow visual markers or respond to information in its environment.

🚗 Smart Vehicles

Advanced driver-assistance and autonomous systems can use cameras together with other sensors to understand parts of the environment around a vehicle.

Visual systems may be used to detect lane markings, traffic signs, vehicles and other relevant objects.

🏥 Computer Vision in Healthcare

Computer vision can assist trained professionals in analysing medical images and identifying patterns that may require attention.

Such systems are tools and should be used appropriately with expert human judgement.

🌱 Computer Vision in Agriculture

Cameras and computer vision systems can help observe crops, plants and agricultural environments.

Visual analysis can support tasks such as monitoring plant growth and identifying visible changes.

🚦 Computer Vision for Safety

Computer vision can support safety systems by detecting relevant objects or changes in an environment.

However, automated systems can make mistakes, so important decisions may still require human supervision.

⚠️ Limitations of Computer Vision

Computer vision systems do not understand images in exactly the same way as humans.

Their performance can be affected by:

• Poor lighting
• Blurred images
• Objects being blocked
• Unusual viewing angles
• Limited or unrepresentative training data

🔒 Privacy and Responsible Use

Cameras can collect visual information, so computer vision systems should be designed and used responsibly.

Important considerations include privacy, security, fairness, consent and the safe use of collected data.

🧠 What is Artificial Intelligence?

Artificial Intelligence (AI) is a field of computing that focuses on creating systems capable of performing tasks that normally require human-like intelligence.

Depending on the system, these tasks may include recognising patterns, processing language, making predictions, solving problems and selecting appropriate actions.

🤖 What is Robotics?

Robotics is the field concerned with designing, building, programming and operating robots.

A robot can use sensors to collect information, a controller to process that information and actuators to perform physical actions.

🔗 AI and Robotics

AI and robotics are related but different fields.

Robotics focuses on machines that can sense and act in the physical world, while AI focuses on computational methods that can help systems analyse information and make decisions.

⚙️ Traditional Robots and AI-Enabled Robots

A traditional robot may follow fixed instructions written by a programmer.

An AI-enabled robot may use additional methods to recognise patterns, estimate situations or choose between possible actions.

🔄 Sense → Think → Act

A simple way to understand intelligent robotics is through the following cycle:

Sense → Process → Decide → Act → Repeat

The robot collects information, processes it, chooses an action and then interacts with its environment.

📡 Sensors: The Robot's Inputs

Sensors help a robot collect information about its surroundings.

Common sensors include:

• Ultrasonic sensors
• Light sensors
• Temperature sensors
• Touch sensors
• Infrared sensors
• Cameras

🧠 The Robot's Decision System

A robot needs a controller or computing system to process information and control its actions.

In an AI-enabled robot, software may analyse sensor data, recognise patterns or estimate which action is appropriate.

⚡ Actuators: The Robot's Actions

Actuators are components that allow a robot to create physical movement or another physical effect.

Examples include:

• DC motors
• Servo motors
• Robot wheels
• Robotic arms
• LEDs
• Buzzers

📊 Why Data Matters

AI systems often use data to identify patterns and produce useful outputs.

A robot may collect data from sensors, cameras or other input devices and use that information to understand its environment.

🔍 Pattern Recognition

Pattern recognition involves identifying useful similarities, features or relationships in data.

For example, a system may analyse visual information to distinguish between different types of objects.

📚 Introduction to Machine Learning

Machine Learning (ML) is an area of AI in which computational models learn patterns from examples or data.

The learned model can then be used to make predictions or classifications for new inputs.

🎓 Training an AI Model

In machine learning, a model is trained using examples.

For example, an image classification system may learn from many labelled images belonging to different categories.

After training, the system can attempt to classify new images.

🧩 What is an AI Model?

An AI model is a computational system designed or trained to perform a particular task.

Different models may be designed for different tasks, such as recognising images, understanding speech or predicting values.

👁️ AI and Computer Vision

Computer vision enables machines to process and analyse visual information from images and videos.

AI techniques can help a robot identify objects, recognise patterns and respond to what its camera observes.

📦 Object Recognition

AI can help a robotic system identify or classify objects using information collected by cameras or other sensors.

For example, a robot may be designed to distinguish between different types of objects for a sorting task.

🗣️ Voice-Controlled Robots

Some robotic systems can receive commands through speech or other forms of natural language input.

Speech-recognition technology can convert spoken words into information that a computer program can process.

🚗 Autonomous Robots

An autonomous robot can perform some tasks with limited or reduced direct human control.

Such robots use sensors, software and control systems to observe conditions and respond according to their programming or decision-making methods.

🚧 Obstacle Avoidance

A robot can use sensors to detect nearby obstacles and respond by stopping, turning or selecting another movement.

More advanced systems may combine information from several sensors to make better decisions.

🗺️ Intelligent Navigation

Navigation involves determining how a robot should move from one location to another.

A robot may use information from cameras, distance sensors, maps or other sources to support navigation.

🔁 Learning from Feedback

Some AI systems can improve their behaviour by using examples, feedback or information about previous results.

The exact method depends on how the AI system has been designed and trained.

✨ What Makes a Robot Smart?

A robot may be considered "smart" when it can use information from its environment to perform useful actions appropriately.

Intelligence in robots can involve perception, decision-making, adaptation and interaction.

🌍 Applications of AI in Robotics

AI-enabled robots can be used in many areas, including:

• Manufacturing
• Healthcare
• Agriculture
• Education
• Exploration
• Transportation
• Environmental monitoring

🏥 AI Robots in Healthcare

Robots can assist trained professionals with selected tasks in healthcare environments.

AI may support the analysis of information, but important healthcare decisions require appropriate professional judgement and oversight.

🌱 AI Robots in Agriculture

Smart agricultural machines can use sensors and cameras to collect information about crops and their surroundings.

Automated systems may support tasks such as monitoring, observation and selected farming operations.

🏭 AI Robots in Manufacturing

Robots are widely used in manufacturing for repetitive and precise tasks.

AI and computer vision can help automated systems inspect products and respond to changing conditions.

🚀 AI Robots in Exploration

Robotic systems can be used to explore environments that may be difficult, distant or dangerous for humans.

Intelligent systems can help robots analyse sensor information and operate with limited direct control.

⚠️ Limitations of AI Robots

AI-enabled robots are not perfect and can make mistakes.

Their performance may be affected by:

• Poor-quality sensor data
• Unexpected environments
• Limited training data
• Incorrect assumptions
• Hardware or software failures

⚖️ Ethics and Responsible AI

AI systems should be designed and used responsibly.

Important considerations include safety, privacy, fairness, security, accountability and appropriate human oversight.