MediaWiki is a free and open-source wiki software. It is used on Wikipedia and almost all other Wikimedia websites, including Wiktionary, Wikimedia Commons and Wikidata; these sites define a large part of the requirement set for MediaWiki.[5] It was developed for use on Wikipedia in 2002, and given the name "MediaWiki" in 2003.[6] MediaWiki was originally developed by Magnus Manske and improved by Lee Daniel Crocker.[7][8] Its development has since then been coordinated by the Wikimedia Foundation.

Original author(s)Magnus Manske, Lee Daniel Crocker
Developer(s)Wikimedia Foundation
Initial releaseJanuary 25, 2002; 21 years ago (2002-01-25)
Stable release
1.39.2[1] Edit this on Wikidata / 22 February 2023; 29 days ago (22 February 2023)
Written inPHP[2]
Operating systemWindows, macOS, Linux, FreeBSD, OpenBSD, Solaris
Size53.23 MiB (compressed)
Available in459[3] languages
TypeWiki software
LicenseGPLv2+[4] Edit this at Wikidata

MediaWiki is written in the PHP programming language and stores all text content into a database. The software is optimized to efficiently handle large projects, which can have terabytes of content and hundreds of thousands of views per second.[5][9] Because Wikipedia is one of the world's largest websites, achieving scalability through multiple layers of caching and database replication has been a major concern for developers. Another major aspect of MediaWiki is its internationalization; its interface is available in more than 300 languages.[10] The software has more than 1,000 configuration settings[11] and more than 1,800 extensions available for enabling various features to be added or changed.[12]

Besides its use on Wikimedia sites, MediaWiki has been used as a knowledge management and content management system on websites such as Fandom, wikiHow, and major internal installations like Intellipedia and Diplopedia.

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