The term for a young male horse is "colt." Typically, a colt is a male horse that is under four years of age. As colts mature, they undergo physical and behavioral changes that prepare them for adulthood. Depending on their breed and training, colts can be raised for various purposes, such as racing, work, or companionship. Training and socialization during their early years are crucial for their development, as it helps in their integration into equestrian activities. Understanding their growth stages is important for horse owners and breeders to ensure the healthy development of colts.