Internet evolution and importance of web technology

Evolution of the Internet

The Internet is a worldwide collection of networks that communicate using TCP/IP. It evolved in these steps:

1. 1969 – ARPANET: A packet-switched network funded by the US Department of Defense, connecting four sites at first (UCLA, SRI, UC Santa Barbara and the University of Utah).
2. 1970s: Email (1971) and the idea of internetworking. Vint Cerf and Robert Kahn developed TCP/IP.
3. 1983: ARPANET adopted TCP/IP; DNS was introduced in 1984.
4. Mid 1980s: NSFNET provided a high-speed academic backbone.
5. 1989-1995: Tim Berners-Lee invented the World Wide Web at CERN; graphical browsers (Mosaic, Netscape) popularised the Internet; commercial ISPs began.
6. 2000s onward: Broadband, Wi-Fi, mobile Internet, social networks, cloud computing and IoT.

ARPANET -> TCP/IP -> NSFNET -> WWW + ISPs -> Mobile/Cloud/IoT
 1969      1983      1986       1990s          2000s+

Importance of web technology

Web technology means the standards and tools (HTML, CSS, JavaScript, HTTP, server-side languages, databases) used to build and deliver content and applications over the Web.

• Information access: Anyone can publish and find information instantly (search engines, e-libraries, news).
• Communication: Email, chat, video calls, social networks and forums connect people across the world cheaply.
• E-commerce: Online shopping, e-banking and digital payments (eSewa, Khalti) reduce cost and time.
• Education: Online classes, learning management systems and open courses reach remote students.
• Platform independence: A web application runs in any browser on any operating system; no installation is needed and updates are central.
• Business and government: E-governance, online tax filing, ticketing and customer services improve transparency and efficiency.
• Entertainment and collaboration: Streaming, online games, shared documents and cloud storage.
• Job creation: Web development, hosting, digital marketing and freelancing create employment.