It depends on which "community" you are referring to.
A. Any geographical community:
Having different cultures -- sometimes diversity can also be achieved within a community of the same race, such as in Switzerland (French, German, Italian, and Romansh) and the British Isles (English, Welsh, Scottish, Manx, Cornish, Irish).
B. The OCG Section of Yahoo Answers:
Users from different races and different views: from White Nationalists, to Black Nationalists, racialists, racists AND anti-White racists (who SHOULD play chess to make use of their time), anti-racists, mainstream conservatives, liberals, and moderates, everybody else, and people who only exist to troll others and spam.
A description is always useful for any question.