Skin and leather are two completely different things. Nowadays, many operators often call leather abbreviated as leather and artificial leather abbreviated as leather. This statement is incorrect and not rigorous.
Skin refers to the state when the skin collagen fibers are still in their body (referring to chemical structure); leather refers to the state when the animal skin is physically and chemically treated, removing useless components in the skin, and causing the chemical structure of the skin to change and different from the state when it is on the animal body. In addition, the leather is soft and easy to bend in dry state, and it is not easy to rot in humid state. The leather is the raw material for leather, and the leather is made of leather.
If the difference between leather and leather is confused with the difference between "natural leather" and "artificial leather" and "artificial leather", it is easy to cause conceptual confusion among lay consumers and increase the difficulty of identifying leather products.