On 12th November 1990 The World Wide Web was first proposed by CERN computer scientists Tim Berners-Lee and Robert Cailliau.

Berners-Lee found an enthusiastic supporter in his colleague and fellow hypertext enthusiast Robert Cailliau who began to promote the proposed system throughout CERN. Berners-Lee and Cailliau pitched Berners-Lee’s ideas to the European Conference on Hypertext Technology in September 1990, but found no vendors who could appreciate his vision.

With help from Cailliau Berners-Lee published a more formal proposal on 12 November 1990 to build a “hypertext project” called World Wide Web (abbreviated “W3”) as a “web” of “hypertext documents” to be viewed by “browsers” using a client–server architecture

By December 1990, Berners-Lee and his work team had built all the tools necessary for a working Web: the HyperText Transfer Protocol (HTTP), the HyperText Markup Language (HTML), the first web browser (named WorldWideWeb, which was also a web editor), the first web server (later known as CERN httpd) and the first web site (http://info.cern.ch) containing the first web pages that described the project itself was published on 20 December 1990. The browser could access Usenet newsgroups and FTP files as well. A NeXT Computer was used by Berners-Lee as the web server and also to write the web browser. – Wikipedia