Internet Applications (Search, eCommerce, Multimedia)

Applications of the Internet

The Internet provides the underlying infrastructure (the 'pipes'), but it is the applications running on top of it that make it useful to everyday users.

1. Web Browsers & Search Engines

Web Browsers

• A Web Browser is a software application used to access and view websites on the World Wide Web (WWW).
• It retrieves HTML files from web servers and renders them into the graphical pages we see.
• Examples: Google Chrome, Mozilla Firefox, Microsoft Edge, Safari.

Search Engines

• A Search Engine is a specialized web-based tool designed to search for information on the World Wide Web.
• It works using three main steps:
  1. Crawling: Automated bots (Spiders) scan the internet to find new or updated web pages.
  2. Indexing: The gathered data is organized and stored in a massive database.
  3. Ranking/Searching: When a user types a query, the engine algorithms retrieve the most relevant indexed pages and rank them.
• Examples: Google, Bing, Yahoo!, DuckDuckGo.

2. Communication: Messaging, Voice Mail & Video Conferencing

Online & Offline Messaging

• Online Messaging (Instant Messaging): Real-time text transmission over the internet (e.g., WhatsApp, Telegram). Both users must be online or the message is delivered the moment the receiver connects.
• Offline Messaging: Communication where the receiver doesn't need to be present at the exact moment of sending. Email (Electronic Mail) is the prime example. It uses protocols like SMTP (for sending) and IMAP/POP3 (for receiving).

Voice Mail & Video Conferencing

• Voice Mail: A computer-based system that allows users to leave recorded audio messages for someone who is unavailable.
• Video Conferencing: Real-time visual and audio communication between two or more people across different locations using VoIP (Voice over Internet Protocol) technologies. (e.g., Zoom, Microsoft Teams).

3. Web Publishing & Multimedia

Web Publishing

• The process of creating, formatting, and uploading content onto the internet.
• It involves designing web pages using HTML/CSS/Scripts, acquiring a Domain Name (e.g., www.example.com), and paying for Web Hosting (renting server space).

Multimedia

• The integration of multiple forms of media including text, graphics, audio, video, and animations.
• In web development, multimedia enhances user engagement but requires higher bandwidth to transmit.

4. e-Commerce (Electronic Commerce)

Types of e-Commerce

• B2B (Business-to-Business): A manufacturer selling wholesale to a retailer.
• B2C (Business-to-Consumer): A retailer selling directly to the end customer (e.g., Amazon, Flipkart).
• C2C (Consumer-to-Consumer): Consumers selling directly to other consumers (e.g., eBay, OLX).
• C2B (Consumer-to-Business): An individual offering services/products to a business (e.g., freelance platforms).