A pitch or a sports ground is an outdoor playing area for various sports. The term pitch is most commonly used in British English, while the comparable term in American and Canadian English is playing field or sports field. The surface of a pitch is most commonly composed of sod (grass), but may also be artificial turf, sand, clay, gravel, concrete, or other materials. A playing field on ice may be referred to as a rink, for example an ice hockey rink, although rink may also refer to the entire building or, in the sport of curling, to either the building or a particular team.