Back after a few years away, looking for a Clan/Tribe

Hi all
I have come back after a few years away and wondering what the difference is between a Clan and a Tribe?
In mind of joining one or both to get involved in some good team games.
thank you
I have come back after a few years away and wondering what the difference is between a Clan and a Tribe?
In mind of joining one or both to get involved in some good team games.
thank you