Harness racing is a form of horse racing in which the horses race at a specific gait. They usually pull a two-wheeled cart called a sulky, spider, or chariot occupied by a driver. In Europe, and less frequently in Australia and New Zealand, races with jockeys riding directly on saddled trotters are also conducted.

Horse racing is an equestrian performance sport, typically involving two or more horses ridden by jockeys over a set distance for competition. It is one of the most ancient of all sports, as its basic premise – to identify which of two or more horses is the fastest over a set course or distance – has been mostly unchanged since at least classical antiquity.