Often, people use "Internet" and "Web" interchangeably, but they refer to different things, of course. The Internet—created before the Web, in the late 1960s—is the network on which the Web operates.
The idea of the Web was conceived just 30 years ago, in March 1989, by British engineer and computer scientist Tim Berners-Lee, who then went on to create HTTP, HTML, a browser and WYSIWYG editor for webpages, and later the URL structure we now know.
The first Web server went online at CERN (the European Organization for Nuclear Research) in late 1990, but it wasn't until August 1991 that Berners-Lee shared details of the Web server and the WWW Browser-Editor to newsgroups and published the first publicly accessible webpage.
His "World Wide Web" has since altered the way we communicate, connect, and live our lives.