Different things
A tribe is people held together by shared meaning: a passion, values and a way of talking about it. Membership is loose and overlapping, and nobody keeps a list.
A community is a specific place where some of those people meet: a club, a forum, a festival, a hashtag, a group in an app. It has edges, often a host and sometimes rules.
How they relate
One tribe moves through many communities. Swedish craft beer culture gathers in consumer associations, homebrew clubs, taprooms, festivals and a rating app. None of them is the tribe, and the tribe is more than all of them together.
On The Tribal Map, communities belong under Spaces: the physical and digital places where the tribe gathers.
Why it matters for brands
Building a brand community means gathering your own followers. Serving a tribe means fitting into a culture that exists without you. Both can work, but they need different strategies. Treating one community as the whole tribe is the most common mistake.