A bicycle sharing system, public bicycle system, or bike share scheme, is a service in which bicycles are made available for shared use to individuals on a very short term basis. Bike share schemes allow people to borrow a bike from point "A" and return it at point "B". Many bike-share systems offer subscriptions that make the first 30–45 minutes of use very inexpensive, encouraging their use as transportation. This allows each bike to serve several users per day. In most bike-share cities, people seeking a bicycle for casual riding over several hours or days are better served by bicycle rental than by bike-share. For many systems, smartphone mapping apps show nearby stations. They show how many bikes and how many open docks are available at each station, increasing convenience for users.