Carsharing or car sharing or car clubs (UK) refers to several models of car rental or car use, where people rent cars for short periods of time, often by the hour. Unlike traditional car rental, collecting and returning the vehicle is often self-service through a mobile app and without entering an office or agency. It also often differs in the length of hire and the cost structure. In some models a commercial company owns the fleet and offers it for member use (business-to-consumer). In other models the owners are private individuals who organise as a cooperative or ad hoc grouping, or list their vehicles with a separate car sharing facilitator (peer-to-peer). Car sharing is part of a larger trend of shared mobility.