Zipcar is a car-sharing service that allows members to rent vehicles by the hour or day. Users can reserve cars through a mobile app or website, making it convenient for those who need a vehicle for short periods without the costs of ownership. The service offers a variety of vehicles, from compact cars to larger models, catering to different needs. Members can access cars parked in designated locations, and the rental fee typically includes gas, insurance, and maintenance, making it an economical choice for urban dwellers and occasional drivers.