Session 1.1 – Introduction to WWW and Internet
Module 1: Introduction to Web Design | Duration: 1 hr
Learning Objectives
By the end of this session, students will be able to:
- Understand the evolution and history of the Internet
- Explain the difference between the Internet and the World Wide Web
- Identify key components and protocols of the Internet
- Understand the basic architecture of web communications
- Recognize the importance of standards in web technologies
Introduction
The Internet and World Wide Web have fundamentally transformed how we communicate, work, learn, and interact with information. Understanding these technologies is essential for anyone working in web development or technology fields.
Key Insight
The Internet is the global network infrastructure, while the World Wide Web is one of many services that runs on top of the Internet. They are related but distinct concepts.
History of the Internet
The Internet evolved from early research networks to become the global communication infrastructure we know today:
1960s - ARPANET
The U.S. Department of Defense's Advanced Research Projects Agency (ARPA) created ARPANET, the precursor to the modern Internet. The first message was sent in 1969 between UCLA and Stanford.
1970s - TCP/IP Protocol
Vint Cerf and Bob Kahn developed the TCP/IP protocol suite, which became the standard for Internet communication in 1983.
1980s - DNS and Email
The Domain Name System (DNS) was introduced in 1984, making it easier to navigate the Internet using memorable names instead of IP addresses.
1990s - World Wide Web
Tim Berners-Lee invented the World Wide Web in 1989 at CERN, introducing HTML, HTTP, and the first web browser.
Key Pioneers
- Tim Berners-Lee: Inventor of the World Wide Web (1989)
- Vint Cerf & Bob Kahn: "Fathers of the Internet" - TCP/IP protocol
- Marc Andreessen: Co-creator of Mosaic, the first popular web browser
The World Wide Web
The World Wide Web (WWW) is an information system where documents and resources are identified by URLs and can be accessed via the Internet using web browsers.
Web Architecture
Figure: Basic Web Communication Model
Core Components of the Web
URLs
Uniform Resource Locators - unique addresses for web resources
HTML
HyperText Markup Language - structures web content
HTTP
HyperText Transfer Protocol - transfers web data
Internet vs World Wide Web
Many people use these terms interchangeably, but they refer to different things:
The Internet
- Global network of interconnected computers
- Physical infrastructure (cables, routers, servers)
- Uses TCP/IP protocol suite
- Supports multiple services: Web, Email, FTP, VoIP
- Existed before the Web (since 1969)
World Wide Web
- Information system running on the Internet
- Collection of websites and web pages
- Uses HTTP/HTTPS protocol
- Accessed through web browsers
- Invented by Tim Berners-Lee in 1989
Analogy
Think of the Internet as a highway system, and the World Wide Web as one type of vehicle (like cars) that travels on that highway. Other vehicles (email, file transfer, streaming) also use the same highway.
Key Internet Concepts
IP Address
A unique numerical label assigned to each device on a network.
IPv6: 2001:0db8:85a3::8a2e:0370:7334
Domain Name
Human-readable address that maps to an IP address via DNS.
google.com → 142.250.185.46
DNS (Domain Name System)
The "phonebook" of the Internet, translating domain names to IP addresses.
DNS resolves to: 93.184.216.34
Web Server
A computer that stores and serves web pages to clients upon request.
- Apache
- Nginx
- Microsoft IIS
Internet Protocols
The Internet relies on a suite of protocols that define how data is transmitted:
TCP/IP Protocol Stack
HTTP, HTTPS, FTP, SMTP, DNS
TCP (Transmission Control Protocol), UDP
IP (Internet Protocol), ICMP
Ethernet, Wi-Fi, Physical transmission
Protocol Overview
- HTTP/HTTPS: Web page transfer
- TCP: Reliable, ordered data delivery
- IP: Addressing and routing packets
- DNS: Domain name resolution
- FTP: File transfer
- SMTP: Email transmission
Session Summary
Key Points
- The Internet is a global network infrastructure that originated from ARPANET in the 1960s
- The World Wide Web is an information system that runs on top of the Internet
- Tim Berners-Lee invented the WWW in 1989, introducing HTML, HTTP, and URLs
- Key Internet concepts include IP addresses, domain names, DNS, and web servers
- The TCP/IP protocol stack enables reliable communication across the Internet
- Understanding the distinction between Internet and WWW is fundamental
Next Session Preview
In the next session, we will explore Client-Server Architecture, understanding how web applications are structured and how clients and servers interact in web communications.