Service refers to an action or work that is produced and then consumed, while utility refers to the ability of a commodity to satisfy needs or wants. In computing, a service is a function provided by one program or machine for another, while a utility is a software program designed to perform a single or small set of tasks to manage hardware, operating systems or software. In sports, a service is the act of serving the ball to start play in tennis or volleyball, while utility refers to the ability to play multiple positions. Overall, a service is an event where an entity acts on behalf of another, and a utility is the state of being useful.