While ikiwiki supports hierarchically categorising pages by creating [[SubPage]]s, that's often not flexible enough, and it can also be useful to tag pages in various non-hierarchical ways. Since this is a wiki, tagging is just a form of linking. For example, since this page links to [[features]], it can be considered to have something to do with ikiwiki's features. If you want to put pages into a category, the typical wiki way to do so is to create a "CategoryFoo" page and link pages in the category to it. That is just another form of tagging. Sometimes you may want to tag a page without putting a visible link on it. The [[tag_plugin|plugins/tag]] allows you to do so, like this: \[[tag mytag othertag thirdtag]] One way to use these tags is to create a [[blog]] of pages that have a particular set of tags. Or just look at the [[BackLinks]] to a tag page to see all the pages that are tagged with it. [[Plugins]] can be written to do anything else with tags that you might desire. Once you have tags, you can use the [[plugins/pagestats]] plugin to generate tag clouds.