Tag Attributes allow you to add even more context to a Tag, making it clear to all users how it should be applied.
Note that Tag Attributes can only be added to individual Tags, not Tag Groups.
Each Tag Category, apart from Amenities (which only has a description field), has its own specific attributes according to that particular category (e.g. Destination Tag Attributes include Continent, Climate, Country, etc).
As an Administrator, Tags and Tag Groups give you the ability to categorize and sort through your Templates. The more Templates you create, the more specific your Tagging can be in order to easily promote your Templates across clients.