A decal is a small, often colorful design or image that can be applied to various surfaces. It usually consists of a thin sheet of paper, vinyl, or other material with an adhesive backing, which allows it to stick onto another surface when pressed into place. Decals are commonly used for decorative purposes, such as adding designs or logos to objects like notebooks, cars, and walls. They can also be used for functional purposes, such as creating labels or warnings on various items.