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1.21.1 -- Is our version out of date? Please let us know.
MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia. It is now used by several other projects of the non-profit Wikimedia Foundation and by many other wikis, including this website, the home of MediaWiki.
Use the links below to explore the site contents. You'll find some content translated into other languages, but the primary documentation language is English.