Extensions Plugin Manager Edit Behaviour Group
From Joomla! Documentation
These plugins take care of automatic management of Tags and Versions when a component adds, saves or deletes an item that uses these features. They must be enabled for the functionality to work.
Behaviour - Taggable
Allows content items to be tagged. This plugin has no parameters.
Behaviour - Versionable
Allows content items to be versioned. This plugin has no parameters.