A "stud" typically refers to a male animal, especially in the context of breeding. In horse breeding, a stud is a male horse that is used for mating with female horses, known as mares. The term can also apply to other animals, such as dogs or cattle, where a stud is chosen for its desirable traits to improve the offspring. In a different context, "stud" can refer to a decorative fastener or an earring. Stud earrings are small, simple pieces of jewelry that sit directly on the earlobe. They can be made from various materials, including gold, silver, or gemstones, and are popular for their understated elegance.