Groups are good ways to encourage community members to interact with one another, and include discussion forums, group meetings, and file and media-sharing. Groups may be public (any community member may view or join this group) or private (group membership must be approved by the creator or moderator of the group.)
Groups can be created within a community site by any community member whose role permits the creation of a group. Groups are not created from the administration side of the system. Groups Administration
Note that Groups may be recommended to any community member based on profile attribute through the Recommendation Engine.
Community administrators might also want to review the details at Groups Administration.