public service

public service
ˌpublic ˈservice noun
1. [countable usually plural] a service, such as transport or health care, that a government provides:
    efforts to improve quality in public services
2. [uncountable and countable] a service provided to people because it will help them, and not for profit:
    Local TV stations ran the ads as a public service.
3. [singular, uncountable] the government or its departments:
    staff cuts in the public service
    He left the public service and embarked on a career in the City.