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A WikiWikiWeb is a collaborative hypertext document produced by a community of users by means of a WikiWiki tool.
The original WikiWikiWeb was established by Ward Cunningham, who invented and named the Wiki concept, and produced the first implementation of a WikiWiki server.
Ward's Wiki remains one of the most popular Wiki sites:
http://www.c2.com/cgi/wiki?WelcomeVisitors
Perhaps you would like to know more about the history of wiki.
The particular Wiki you are looking at is Wikipedia, an effort to write a complete encyclopedia from scratch, collaboratively. We're currently adding articles at a pace of many hundreds per month.
You can search various wikis at once, including this and Ward's, using MetaWiki.