noun
Refers to the physical inside or interior surface of an object, container, or space.
箱の内面をきれいに拭いてください。
Please wipe the inside of the box clean.
noun
inner self; one's mind
Used for a person's inner world, thoughts, feelings, or true character, often in contrast to outward appearance.
彼は外見は怖そうだが、内面はとても優しい。
He looks scary on the outside, but inside he is very kind.