Thoroughbreds are a breed of horse best known for their speed and agility, primarily used in horse racing. Originating in the 17th and 18th centuries in England, they were developed by crossing native mares with imported Arabian, Barb, and Turkoman stallions. Thoroughbreds are characterized by their tall, slim build, long legs, and powerful muscles, making them ideal for racing. These horses are not only popular in racing but also excel in various equestrian sports, including show jumping and dressage. The Kentucky Derby and Royal Ascot are two of the most famous races featuring Thoroughbreds, showcasing their exceptional abilities and competitive spirit.