[Subversion](http://subversion.tigris.org/) is a revision control system. While ikiwiki is relatively independent of the underlying revision control system, and can easily be used without one, using it with Subversion is recommended since it's how the author uses it. ([[Git]] is another option.) Ikiwiki can run as a [[post-commit]] hook to update a wiki whenever commits come in. When running as a [[cgi]] with Subversion, ikiwiki automatically commits edited pages to the subversion repostory, and uses the Subversion log to generate the [[RecentChanges]] page.