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A '''Wiki''' or '''wiki''' (pronounced "wicky", "weekee" or "veekee"; see pronunciation section below) is a website (or other hypertext documents collection) allowing users to add content, as on an Internet forum, but also allows anyone to edit the content. "Wiki" also refers to the collaborative software used to create such a website (''see [[Wiki software]]'').

''Wiki'' (with an upper case 'W') and ''WikiWikiWeb'' are both used to specifically refer to the [[Portland Pattern Repository]], the first-ever wiki. This usage's proponents suggest a lower-case 'w' for wikis in general. ''Wiki wiki'' comes from the Hawaiian term for "quick" or "super-fast."; sometimes, '''wikiwiki''' or '''WikiWiki''' or '''Wikiwiki''' are used instead of ''wiki..''

[http://www.worldwidewiki.net/wiki/SwitchWiki WorldWideWiki: SwitchWiki], which currently lists about 1000 public wiki communities ([[as of 2004]]-06-12).