Thoroughbred racing is a sport and industry involving the racing of Thoroughbred horses.It is governed by different national bodies. There are two forms of the sport – flat racing and jump racing, the latter known as National Hunt racing in the UK and steeplechasing in the US. Jump racing can be further divided into hurdling and steeplechasing

Thoroughbred breeding theories are used by horse breeders in an attempt to arrange matings that produce progeny successful in horse racing.Bloodstock experts also rely on these theories when purchasing young horses or breeding stock. A basic understanding of these theories can also help the racing public understand a horse's theoretical genetic potential.