community service
US /kəˈmjuː.nə.ti ˌsɜːr.vɪs/
UK /kəˈmjuː.nə.ti ˌsɜːr.vɪs/

1.
voluntary work intended to help people in a particular area
:
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She dedicates her weekends to community service at the local shelter.
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Many students participate in community service projects.
2.
unpaid work that an offender does in the community as a punishment instead of going to prison
:
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The judge sentenced him to 200 hours of community service.
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Instead of jail time, he received a sentence of community service.