Tags may refer to

In the software:

  • Tag extensions, which introduce custom XML-like tags in the MediaWiki syntax (e.g. <example>value</example>)
  • #tag parser function, a built-in parser function in MediaWiki that allows invocation of an extension tag using the "{{#tag:...}}" syntax
  • Revision tags (change tags), annotations applied to individual edits and used to group or highlight edits that meet certain conditions

On mediawiki.org: