Sir Tim Berners-Lee, the British scientist working at CERN, the large particle physics laboratory near Geneva, invented something in the late 1980s that is still in use today.
The World Wide Web (WWW) officially celebrates its 30th birthday today, after its creation by Sir Tim to help scientists share information more easily.
And the rest as they say, is history.
Sir Tim first proposed the idea of a system which would turn into World Wide Web on 12 March 1989.
Remember, the Internet had already been invented by then, thanks to the likes of Vint Cerf and a few other people.
Indeed it is important to remember that the Internet and the World Wide Web are not the same thing.