TWiki Markup Language (.wiki)
The TWiki Markup Language (WIKI) file extension is used for documents created with TWiki, an open-source wiki application designed for collaborative documentation and project management. TWiki allows users to format text, and create headings, lists, and tables using simple markup syntax, making it accessible even for those without HTML knowledge. TWiki was developed in the early 2000s and has since been widely adopted for its ease of use and powerful collaboration features.