A sticker is a small piece of paper or plastic that has a picture or design on it. Stickers can be round, square, or any shape! They can have words, like "cool" or "awesome," or pictures, like a heart or a dinosaur. Stickers are often used to decorate things like notebooks, water bottles, or even cars! To use a sticker, you peel off the back part, which is called the "backing," and carefully stick it onto whatever you want to decorate. It's like a mini puzzle - you just have to figure out where you want to put it! Some stickers are also scratch-and-sniff, which means that they smell good when you scratch them! Overall, stickers are a fun way to personalize your belongings and show off your personality!