Thoroughbred racehorses are a breed of horse known for their speed, agility, and endurance. Originating in the 17th and 18th centuries in England, they were developed through selective breeding of Arabian, Barb, and Turk horses. Thoroughbreds are typically tall and slim, with long legs and a deep chest, making them well-suited for racing. These horses are primarily used in horse racing, a popular sport where they compete on tracks. Thoroughbreds are recognized for their competitive spirit and are often seen in prestigious events like the Kentucky Derby and the Royal Ascot. Their training and care are crucial for optimal performance on the racetrack.