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MediaWiki
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<p>MediaWiki is <a href="/facts/Free_and_open-source/1cHtjLCB">free and open-source</a> <a href="/facts/Wiki_software/zNRxq6GV">wiki software</a> originally developed by <a href="/facts/Magnus_Manske/XwSKMqIU">Magnus Manske</a> for use on <a href="/facts/Wikipedia/La2xLBFt">Wikipedia</a> on January 25, 2002, and further improved by <a href="/facts/Lee_Daniel_Crocker/9qeDAXl0">Lee Daniel Crocker</a>, after which development has been coordinated by the <a href="/facts/Wikimedia_Foundation/W1XHdpK2">Wikimedia Foundation</a>. It powers several wiki hosting websites across the Internet, as well as most websites hosted by the Wikimedia Foundation including Wikipedia, <a href="/facts/Wiktionary/CkYghv2h">Wiktionary</a>, <a href="/facts/Wikimedia_Commons/lzkBFxTg">Wikimedia Commons</a>, <a href="/facts/Wikiquote/msvTRKju">Wikiquote</a>, Meta-Wiki and <a href="/facts/Wikidata/5Myy74K5">Wikidata</a>, which define a large part of the set requirements for the software. Besides its usage on Wikimedia sites, MediaWiki has been used as a <a href="/facts/Knowledge_management/RjjnVmRe">knowledge management</a> and <a href="/facts/Content_management_system/CCk4vIxV">content management system</a> on websites such as <a href="/facts/Fandom_(website)/RNqYh1tx">Fandom</a>, <a href="/facts/WikiHow/dy9RsuV9">wikiHow</a> and major internal installations like <a href="/facts/Intellipedia/eqeR486X">Intellipedia</a> and <a href="/facts/Diplopedia/Vq045P73">Diplopedia</a>. </p><p>MediaWiki is written in the <a href="/facts/PHP/02Lfe6RM">PHP</a> <a href="/facts/Programming_language/cWTYbgWa">programming language</a> and stores all text content into a <a href="/facts/Database/VYcpkevb">database</a>. The software is optimized to efficiently handle large projects, which can have terabytes of content and hundreds of thousands of <a href="/facts/Pageviews/re33ACxJ">views</a> per second. Because Wikipedia is one of the world's largest and most visited websites, achieving scalability through multiple layers of <a href="/facts/Database_caching/9pakVo8M">caching</a> and <a href="/facts/Database_replication/QIaooMjL">database replication</a> has been a major concern for developers. Another major aspect of MediaWiki is its internationalization; its interface is available in more than 400 languages. The software has hundreds of configuration settings and more than 1,000 <a href="/facts/Software_extension/351Du3Wu">extensions</a> available for enabling various features to be added or changed. </p>