Sticker is a small piece of paper or plastic with a picture or writing on one side and a sticky substance on the other, used for decorating or attaching to things.
In digital communication, sticker refers to a small image or animation used to express emotions or ideas in messaging apps.
The term "sticker" can also mean:
1. A persistent or determined person (informal)
2. A price tag or label that's hard to remove
3. In sports, a player who sticks close to an opponent