Horse is a mammal of the family Equidae. The horse has evolved over the past 45 to 55 million years from a small multi-toed creature, Eohippus, into the large, single-toed animal of today. Horses are herbivores with a digestive system that allows them to subsist on a diet of forage alone.

The modern horse is adapted to survive in areas of wide open space with sparse vegetation. It has a large head with long ears, a long neck, a deep chest, and a short back. Its legs are long and slender, and its hooves are hard and pointed. The coat is usually short and dense, and the mane and tail are thick and long.

The horse is an important animal in human history and has been used by humans for transportation, agriculture, and warfare. Today, it is used for recreation, racing, and sport. The horse is also used for therapeutic purposes and is sometimes kept as a pet.