Harness racing is a popular horse racing sport where horses are harnessed to special carts called sulkies. There are several synonyms for harness racing, such as trotting races, sulky racing, and standardbred racing. Trotting races refer to the gait of the horse where the legs move in diagonal pairs instead of the galloping motion seen in thoroughbred racing. Sulky racing refers to the type of cart used in the race, while standardbred racing refers to the breed of the horse used in the sport. No matter what it's called, harness racing is an exciting and thrilling sport that offers plenty of action for both casual and serious bettors.