What is a "thoroughbred (horse)"?

The Thoroughbred is a breed of horse that is renowned for its speed and agility. Originally developed in England in the 17th and 18th centuries, it was bred for racing and remains the most popular breed for horse racing worldwide. Thoroughbreds have a distinctive long, slim body, with powerful legs and a deep chest that allows for efficient oxygen intake during racing. They are known for their high energy levels, intelligence, and competitive spirit, which makes them excellent racehorses. Due to their athletic abilities, Thoroughbreds are also used in other equestrian sports such as show jumping, dressage, and eventing.