MediaWiki Markup Language (.wiki)
The WIKI file extension is associated with MediaWiki Markup Language, also known as wikitext or wikicode. It is used to format pages on MediaWiki-powered sites like Wikipedia. The markup language includes syntax and keywords for structuring content, such as headings, lists, and links. MediaWiki, initially developed for Wikipedia, has evolved to support a broader range of third-party users. The markup language facilitates collaborative editing and content management on these platforms.