Tanning is the process of treating animal hides to make them suitable for use in clothing, furniture, and other items. The hides are treated with a variety of chemicals and processes to make them more durable and resistant to water, bacteria, and other elements. Tanning is an ancient practice that has been used for centuries to make leather products. The most common type of leather is cowhide, but other animals such as sheep, goats, pigs, and even fish can be used to make leather. Different types of leather are used for different purposes, depending on the desired look, feel, and durability. Full-grain leather is the most durable and is often used for furniture, shoes, and other items that require a lot of wear and tear. Top-grain leather is slightly less durable but is often used for clothing and accessories. Nubuck leather is a type of top-grain leather that has been buffed to give it a soft, velvety feel. Suede is a type of leather that has been buffed on the flesh side to give it a soft, fuzzy texture. Patent leather is a type of leather that has been treated with a glossy finish. It is often used for shoes and other accessories. Exotic leathers such as snake, alligator, and ostrich are also used for clothing and accessories.