Computer Studies

13. Internet & Web Technologies

Introduction to Internet & Web Technologies

Internet and web technologies are fundamental parts of modern computing. They allow people to communicate, access information, share data, and use online services from anywhere in the world.

Today, education, business, banking, entertainment, and social communication all depend heavily on internet-based technologies.

Internet Basics

The Internet is a global network of interconnected computer networks that communicate with each other using standardized communication protocols.

It allows millions of computers and devices worldwide to exchange data and share information.

The Internet does not belong to a single organization or government. Instead, it is a worldwide system made up of many independent networks connected together.

Key Features of the Internet

Global Connectivity
The Internet connects computers across countries and continents.

Information Sharing
Users can share text, images, videos, software, and documents.

Communication
People can communicate using email, messaging, and video calls.

Access to Online Services
Users can access services such as online banking, e-learning, social media, and cloud storage.

Requirements to Access the Internet

To connect to the Internet, a user generally needs:

• A computer or smart device
• Internet connection (wired or wireless)
• Internet Service Provider (ISP)
• Web browser or internet application

An Internet Service Provider (ISP) is a company that provides internet access to users.

Examples include:

• PTCL
• Nayatel
• StormFiber

World Wide Web (WWW)

The World Wide Web (WWW) is a system of interlinked web pages and multimedia content that can be accessed through the Internet.

It is one of the most widely used services on the Internet.

The web was invented by Tim Berners-Lee in 1989 to help researchers share information easily.

Web pages are created using languages such as:

• HTML (HyperText Markup Language)
• CSS (Cascading Style Sheets)
• JavaScript

These web pages are stored on web servers and accessed by users through web browsers.

Key Components of the Web

Web Pages
A web page is a digital document displayed in a browser.

Websites
A collection of related web pages stored under a single domain name.

Example:

www.example.com

URL (Uniform Resource Locator)
A URL is the address used to access a specific web page on the Internet.

Example:

https://www.example.com/about

HTTP/HTTPS
These are communication protocols used to transfer web pages between servers and browsers.

Web Browsers

A web browser is a software application used to access and display web pages from the Internet.

Browsers interpret HTML, CSS, and JavaScript code to display websites in a user-friendly format.

Functions of a Web Browser

• Access websites using URLs
• Display web pages and multimedia content
• Download files from the Internet
• Support extensions and plugins
• Store browsing history and bookmarks

Examples of Web Browsers

Commonly used web browsers include:

• Google Chrome
• Mozilla Firefox
• Microsoft Edge
• Safari
• Opera

Browsers communicate with web servers to request web pages and display them on the user's device.

Search Engines

A search engine is a software system designed to help users find information on the Internet.

Search engines index billions of web pages and allow users to search for information using keywords.

When a user enters a search query, the search engine analyzes its database and returns the most relevant results.

Functions of Search Engines

• Index web pages from across the Internet
• Search for information using keywords
• Rank results based on relevance
• Provide links to websites, images, videos, and documents

Examples of Search Engines

Popular search engines include:

• Google
• Bing
• Yahoo
• DuckDuckGo

Example search query:

best schools in Karachi

The search engine will display related websites and information.

Search engines use complex algorithms to determine which results are most useful to users.

Email and Cloud Services

The Internet provides many communication and storage services, including email and cloud computing.

Email (Electronic Mail)

Email is a system used to send and receive digital messages over the Internet.

It allows users to communicate quickly and send documents, images, and other files.

Components of an Email Address

An email address generally has two parts:

username@domain.com

Example:

student@gmail.com

• Username identifies the individual user
• Domain represents the email service provider

Features of Email

• Send and receive messages instantly
• Attach files such as documents and images
• Organize messages into folders
• Send messages to multiple recipients

Examples of Email Services

Common email services include:

• Gmail
• Outlook
• Yahoo Mail

Cloud Services

Cloud computing refers to storing data and running applications on remote servers accessed through the Internet instead of on a local computer.

Cloud services allow users to access their files and applications from anywhere with an internet connection.

Advantages of Cloud Services

Remote Access
Users can access data from any location.

Data Backup
Files stored in the cloud are protected from local device failure.

Collaboration
Multiple users can work on the same files simultaneously.

Scalability
Storage and computing resources can easily be increased when needed.

Examples of Cloud Services

Popular cloud platforms include:

• Google Drive
• Dropbox
• Microsoft OneDrive
• iCloud

These services allow users to store documents, photos, videos, and other data online.

Conclusion

Internet and web technologies have transformed how people communicate, learn, and access information. The Internet provides a global infrastructure for connecting computers, while the World Wide Web enables users to access web pages and multimedia content through browsers. Search engines help users quickly find information online, and services such as email and cloud computing support communication and data storage. Understanding these technologies is essential for effectively using modern digital systems and participating in today's connected world.