Help:What is a Wiki
From ApCoCoAWiki
A Wiki allows users to freely create and edit web page content on a web server using any web browser. Wiki supports links and has a simple text syntax for creating new pages and references between internal pages on the fly. This makes it the tool of choice for large, multiple-participant projects.
Have a look at this video over at Common Craft Productions if you want to understand how it works: Wikis in Plain English (requires Adobe Flash Player)
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