also: ステッカ
noun
sticker; adhesive label
Refers to a small piece of paper or plastic with adhesive backing, used for decoration, labeling, or promotion.
ノートにステッカーを貼った。
I put a sticker on my notebook.
このステッカーは防水加工がしてある。
This sticker has a waterproof coating.
シール is a broader term for seals and stickers, often implying a decorative or collectible item, while ステッカー specifically refers to adhesive labels or stickers, often with a printed message or design.
Loanword from English 'sticker'.