World Wide Web
Although originally proposed in 1989, the web was first launched and used in the early 1990s. Tim Berners-Lee (pictured), with help from Robert Cailliau, was able to connect hypertext with the internet and create the foundation for what we know as the web today. Web browsers such as Mosaic and Netscape Navigator helped popularize the web in the 1990s.
Image: World Wide Web Consortium