Skin, Hide, Peel
noun
The kanji and the word are exactly the same. That means they share meanings as well. 皮 refers to skin as something separate from the body. You can use 皮 for when your skin starts to peel off with sunburn, or for animal skin when it is being stripped off or turned into a hide. You can also use 皮 to describe the outer layer of fruits and vegetables, like apple skins or banana peels.
かわ
Since this word is made up of a single kanji, it should use the kun'yomi reading. You haven't learned this reading yet, so here's a mnemonic to help you: As a human (we think), you have a lot of skin. But sometimes a normal shower isn't enough to wash all that skin. What do you do when you can't fit all your skin in the shower or the tub? You get your skin cleaned at the car wash, of course!
このカーペットは、牛の皮です。
This carpet is made of cow hide.
ギョーザの皮と牛肉がある。
There are gyoza wrappers and beef.
メロンの皮はピーラーでは中々むけませんね。
Melon rind is not the easiest to peel with a peeler.