This is the 2960th most frequent Japanese word.
シール
Sticker.
In this sentence, the word シール (seal/sticker) is used to refer to decorative stickers that can be placed on objects.
このアルバムにはたくさんのかわいいシールを貼りました。
I attached many cute stickers to this album.
Here, シール (seal/label) is used as a label affixed to an item for identification purposes.
パッキングするときに箱にシールを貼って名前を書きました。
When packing, I attached a label to the box and wrote the name on it.
In this example, シール (seal/adhesive) is utilized in the sense of a seal used to close and secure openings.