A stallion is an uncastrated male horse, typically used for breeding. They are known for their strength, agility, and distinctive physical features, such as a muscular build and a thick mane. Stallions can be found in various breeds, each with unique characteristics and purposes, including racing, work, and leisure riding. Stallions often exhibit strong territorial behavior and can be more aggressive than geldings (castrated males) or mares (females). Due to their temperament, they require experienced handling and training. Breeders often select stallions based on their lineage, performance, and conformation to produce desirable offspring in the equine world.