Zipcar.com is a car-sharing service that offers an alternative to traditional car rental and ownership. Users can book cars on demand by the hour or day, with gas and dedicated parking included. The service allows members to reserve cars through an app, unlock and lock them during the trip, and return them to the same location. Zipcar provides a variety of vehicles, including compact sedans, luxury SUVs, and vans, catering to different needs. The service aims to offer a cost-effective and convenient transportation solution, reducing the need for personal car ownership and contributing to sustainable urban living.