Tribes is a feature in Dappre that allows you to bring people together around a topic or event. The members of a Tribe can then create and join Channels.
You can create your own Tribe or join a Tribe created by someone else. The person creating a Tribe automatically becomes the Chief of that Tribe. The Chief can then invite people to join his Tribe. Members of a Tribe can also invite other people to the Tribe but it is up to the Chief to accept the new member requests.
Joining a Tribe is done by scanning a Tribes QR code with Dappre or by clicking the connect button in an invitation.