This is the 854th most frequent Japanese word.
皮
Skin, hide, or peel.
皮 is used here to mean the outer skin or layer of an object, specifically the peel of a fruit, which is tangible and removable.
りんごの皮をむいて食べました。
I peeled the apple's skin and ate it.
皮 is used metaphorically here to refer to the superficial layer or facade, indicating a lack of depth or content.
彼の話は皮だけで中身がありませんでした。
His story had only the facade and no substance.
皮 is used in a biological context to describe the natural covering that is shed by certain animals, like the skin of a snake.