4 Answers

A service is the intangible equivalent of an economic good. Service provision is often an economic activity where the buyer does not generally, except by exclusive contract, obtain exclusive ownership of the thing purchased. The benefits of such a service, if priced, are held to be self-evident in the buyer's willingness to pay for it. Public services are those society as a whole pays for through taxes and other means.

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it where you serve. like serve dinner

There are several definitions:  The act of working for someone or something either for pay or for free.  Friendly help.  Or, it could be a religious ceremony.

A shot to start a point in tennis or table tennis.