Brief History of the Internet

Early Networks: The Internet grew out of research into computer networking during the 1960s. One important project was ARPANET, funded by the U.S. Department of Defense's Advanced Research Projects Agency. In 1969, ARPANET connected computers at several universities and research institutions. It demonstrated that computers in different locations could exchange information over a network.

TCP/IP and the Modern Internet: As computer networks expanded, researchers needed common rules that would allow different networks to communicate. Vint Cerf and Bob Kahn helped develop the TCP/IP protocol suite. On January 1, 1983, ARPANET officially adopted TCP/IP. This transition is often considered a major milestone in the creation of the modern Internet because it allowed separate networks to connect as a larger network of networks.

The World Wide Web: The Internet and the World Wide Web are related, but they are not the same thing. The Internet is the underlying global network. The Web is a system for accessing linked documents and other resources over that network. In 1989, British computer scientist Tim Berners-Lee, working at CERN, proposed the World Wide Web. He developed key technologies including HTML, HTTP, and the URL system, and the first website became available in the early 1990s.

Growth and Everyday Use: During the 1990s, graphical web browsers made the Web easier for the public to use. Commercial Internet service expanded, and websites, email, search engines, online shopping, and digital news became increasingly common. Broadband, Wi-Fi, smartphones, social media, cloud computing, streaming, and other technologies later made Internet access a routine part of work, education, entertainment, communication, and commerce.

Why It Matters: The history of the Internet is not the story of one invention or one person. It is the result of decades of research, engineering, standards development, government and university projects, private-sector innovation, and international cooperation. Understanding milestones such as ARPANET, TCP/IP, and the World Wide Web helps explain how today's connected digital world developed.