This isn't mine, but this is an urgent question so writing my own answer would be time consuming, so here's a non-plagiarised answer :
Community is much more than belonging to something. It's about doing something together that makes belonging matter. We also talk about being in community and having a sense of community or community spirit. This is what it means to be in a genuine community — a feeling of belonging, of togetherness.
This is a different perspective from someone else :
A community is a group of people who share something in common. You can define a community by the shared attributes of the people in it and/or by the strength of the connections among them. You need a bunch of people who are alike in some way, who feel some sense of belonging or interpersonal connection.