The creator of the World Wide Web was Tim Berners-Lee, a British Scientist working for CERN. He wrote the first proposal for the World Wide Web in March 1989. In late 1990, Tim Berners-Lee had a functional browser and web server operational at CERN to show how the system works.
The very first web page address can be viewed here on the CERN website http://info.cern.ch/hypertext/WWW/TheProject.html
There is further information linked from this page as to how the World Wide Web functions.
See this additional reference material on the CERN website: https://home.cern/science/computing/birth-web/short-history-web
This video was also published by CERN about the history of the World Wide Web on YouTube and is worth having a look. 3:36 minutes play time.
A Brief History of the Word Wide Web
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