Show jumping, also known as "stadium jumping" or "jumpers," is a member of a family of English riding equestrian events that also includes dressage, eventing, hunters and equitation. Jumping classes are commonly seen at horse shows throughout the world, including the Olympics. Sometimes shows are limited exclusively to jumpers, sometimes jumper classes are offered in conjunction with other English-style events, and sometimes show jumping is but one division of very large, all-breed competitions that include a very wide variety of disciplines. Jumping classes may be governed by various national horse show sanctioning organizations, such as the United States Equestrian Federation in the USA. However, international competitions are governed by the rules of the Fédération Équestre Internationale (FEI).