It was developed for use on Wikipedia in 2002, and given the name “MediaWiki” in 2003. It remains in use on Wikimedia and almost all other Wikimedia websites, including Wiktionary, Wikimedia Commons and Wikidata; these sites continue to define a large part of the requirement set for MediaWiki. Its development is coordinated by the Wikimedia Foundation.
MediaWiki is written in the PHP programming language and stores all text content into a database. The software has more than 1,000 configuration settings and more than 1,800 extensions available for enabling various features to be added or changed.
Besides its use on Wikimedia sites, MediaWiki has been used as a knowledge management and content management system on many thousands of websites, public and private.
But MediaWiki is much more: It is a contribution to a free web. It is a tool for everyone who wants to make freely accessible and verifiable knowledge available. Wikipedia’s culture of knowledge sharing was encoded in MediaWiki.