Groups in Discourse are just a collection of users.
They allow you to:
-
Restrict a category usage. Eg: only this group can see, only that group can post, etc.
-
Give group members, flairs, titles, trust_levels, etc.
-
Direct incoming emails at a specific address as Discourse PMs for this Group.
-
Have a feed of that group posts across a site, eg: Discourse team - Discourse Meta
If you want to
You may be looking to create a new category and restrict all access of this new category for this group.