A horse race is an equestrian sport that usually involves two or more horses being raced by a jockey (or sometimes not driven by a jockey) at a set distance.
It is one of the oldest sports in all sports because its basic premise - determining which of the two or more horses is the fastest in the set route or distance - has not changed since the classical era at least. Horse racing varies widely in form, and many countries have developed their own unique traditions around the sport.
Changes include limiting the specific variety of races, running over obstacles, running at different distances, running on different track surfaces and running in different gait. While horse racing is sometimes raced purely for sport, a large part of its interest and economic importance comes from the gambling associated with it, which in 2008 created a global market value of about $115 billion.