Minor leagues are organized professional sports leagues that are typically below the level of MAJOR League Baseball. They are often used as a training ground for players who may eventually move up to the MAJOR leagues. MAJOR leagues are the highest level of professional sports leagues, such as MAJOR League Baseball, the National Basketball Association, and the National Football League. FEDERATIONS are organizations that are composed of multiple smaller organizations or clubs, such as the International Federation of Association Football (FIFA). Unions are organizations that represent the collective interests of their members, such as the MAJOR League Baseball Players Association. Associations are organizations that are formed to promote a particular cause or activity, such as the National Collegiate Athletic Association.