A tag library, in Dreamweaver, is a collection of tags of a particular type, along with information about how Dreamweaver should format the tags. Tag libraries provide the information about tags that Dreamweaver uses for code hints, target browser checks, the Tag Chooser, and other coding capabilities. Using the Tag Library editor, you can add and delete tag libraries, tags, attributes, and attribute values; set properties for a tag library, including format (for easy identification in the code); and edit tags and attributes.