from one perspective, a community can be a group from your chosen place or town that you live in, and most of the time you are prior to live in that area at birth. in that community, you have an obligation to unify with the people who live in the same area whether you like it or not. while in another perspective, it can be a group of your favored interests, whether a community of artists, community of people who support animal rights, people who support feminism, who support the lgbtq, and etc.
