The Thoroughbred horse is a breed known for its speed, agility, and endurance, primarily used in horse racing. Originating in the 17th and 18th centuries in England, these horses are characterized by their tall, slim build and long legs, which contribute to their impressive racing capabilities. Thoroughbreds are typically between 15.2 and 17 hands high and come in various colors, with bay, chestnut, and gray being the most common. They are also recognized for their spirited temperament and strong work ethic, making them popular not only in racing but also in other equestrian sports like show jumping and dressage.