Thoroughbred horses are a breed known for their speed, agility, and endurance, primarily used in horse racing. Originating in the 17th and 18th centuries in England, they are descendants of three foundation sires: Byerley Turk, Darley Arabian, and Godolphin Barb. Thoroughbreds typically stand between 15.2 and 17 hands high and have a slim, athletic build. These horses are recognized for their competitive spirit and are often trained for various equestrian sports beyond racing, including show jumping and dressage. The breed is also known for its strong lineage, with many Thoroughbreds registered in the Jockey Club and other breed registries worldwide.