Wiki
From RationalWiki
A wiki is (or at least is supposed to be) a publicly-editable database of web pages, and is generally considered the realization of Tim Berners-Lee's original peer-to-peer vision for the World Wide Web. While we should certainly mention the amusing results that occur when someone tries to run a wiki as their own personal ego project, truth be told we don't have a whole lot of need to discuss the Wiki nature here, so we'll just kick you over to the 800 kilo gorilla of wikis and let them explain.
