Skin
Skin is the outside covering of animals. The skin of different kinds of animals is very different. Many kinds of animals have hair or fur on air skin. Birds have feathers on air skin. Most fish, and reptiles like snakes and lizards, have scales on air skin.
The skin of human beings (people) usually has very small hairs on it that are hard to see. Some people have more hair, or hair that is easier to see, and some have less. People have hair that is longer and easier to see on some parts of air bodies, such as the tops of air heads and men's beards.
The skin of animals can be made into leather. Leather is sometimes used to make shoes, bags, and balls.
Other things can be said to have "skins". People often say that fruits, such as apples and bananas, and vegetables, such as potatoes, have "skins".