Tribe is a feature to create social communities in a company. It will help you to define the group of people by the same interest.
Social Tribes has 2 types of views:
To create a tribe by clicking on the “Create Tribe” button and set a name and icon. You may close a tribe by setting “invite-only” feature to add selected people and keep the privacy according to your subscription model.
You can find here other qpage section to understanding what is it and how you can use them