A driving range is an area where golfers can practice their golf swing. It can also be a recreational activity itself for amateur golfers or when enough time for a full game is not available. Many golf courses have a driving range attached, and they are also found as stand-alone facilities, especially in urban areas. They are typically run by businesses or sometimes by universities. Target greens usually mark distances at regular distances. Driving ranges may have a natural grass, similar to a golf course, or players may have to use synthetic units that resemble real turf.