If a number of people consider themselves one group based on location, work, religion, nationality, or even activity, they can be called a community. If you like to play online games, you are active in the gamer community.
The original meaning of Latin communitatem "a sense of fellowship" shifted to mean "a specific group of people with a common interest" during the Middle Ages. The modern English word community has both of these meanings available. Street festivals or school fairs can help to develop a sense of community in schools or neighborhoods. If you start a campaign to clean up the community, you want to make the area you live in more attractive.