Other forms: community services
Community service is volunteer work that helps your neighborhood, town, or city. Sometimes people are required to do community service as punishment.
When you do community service, you serve your community — this could involve reading to kindergarteners, cleaning up the neighborhood park, or working at a food bank. You don't get paid for this kind of volunteer work, but it's sometimes done in exchange for school credit. Community service is occasionally required at certain workplaces, or doled out as punishment: "They were found guilty of trespassing and had to perform 100 hours of community service."