A league system is a hierarchy

Hierarchy

A hierarchy is an arrangement of items in which the items are represented as being "above," "below," or "at the same level as" one another...

 of leagues

Sports league

League is a term commonly used to describe a group of sports teams or individual athletes that compete against each other in a specific sport. At its simplest, it may be a local group of amateur athletes who form teams among themselves and compete on weekends; at its most complex, it can be an...

 in a sport, usually with a system of promotion and relegation

Promotion and relegation

In many sports leagues around the world, promotion and relegation is a process that takes place at the end of each season. Through it, teams are transferred between divisions based on their performance that season...

 between consecutive levels of the hierarchy. They are often called pyramids due to their tendency to split into an increasing number of regional divisions the further down the pyramid one descends. League systems are used in a number of sports, especially association football, rugby league

Rugby league

Rugby league football, usually called rugby league, is a full contact sport played by two teams of thirteen players on a rectangular grass field. One of the two codes of rugby football, it originated in England in 1895 by a split from Rugby Football Union over paying players...

 and rugby union

Rugby union

Rugby union, often simply referred to as rugby, is a full contact team sport which originated in England in the early 19th century. One of the two codes of rugby football, it is based on running with the ball in hand...

.

In North America, a similar league system exists, but without promotion or relegation. Most professional sports are divided into major and minor league

Minor league

Minor leagues are professional sports leagues which are not regarded as the premier leagues in those sports. Minor league teams tend to play in smaller, less elaborate venues, often competing in smaller cities. This term is used in North America with regard to several organizations competing in...

s. While baseball

Baseball

Baseball is a bat-and-ball sport played between two teams of nine players each. The aim is to score runs by hitting a thrown ball with a bat and touching a series of four bases arranged at the corners of a ninety-foot diamond...

 and association football (known as soccer in North America) have well-defined pyramid shapes to their minor league hierarchies, ice hockey

Ice hockey

Ice hockey, often referred to as hockey, is a team sport played on ice, in which skaters use wooden or composite sticks to shoot a hard rubber puck into their opponent's net. The game is played between two teams of six players each. Five members of each team skate up and down the ice trying to take...

's professional minor league system is linear, with one league at each level. The systems for American football

American football

American football is a sport played between two teams of eleven with the objective of scoring points by advancing the ball into the opposing team's end zone. Known in the United States simply as football, it may also be referred to informally as gridiron football. The ball can be advanced by...

 and basketball

Basketball

Basketball is a team sport in which two teams of five players try to score points by throwing or "shooting" a ball through the top of a basketball hoop while following a set of rules...

 are far less organized.

See also

• Group tournaments
• List of professional sports leagues