While ikiwiki supports hierarchically categorising pages by creating [[SubPages|ikiwiki/SubPage]], 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. The general rule is that all tags are links, but not all links are tags. So a tag is a special link that ikiwiki knows is intended to be used as a tag. Generally you will 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]] You can also tag a page with a visible link: \[[!taglink mytag]] This tag will be displayed just like a regular [[ikiwiki/WikiLink]]. 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.