A sticker is a type of label: a piece of printed paper or plastic with pressure sensitive adhesive on one side. They can be used for decoration, depending on the situation. They can come in many different shapes, sizes and colours and are put on things such as lunchboxes, in children's rooms, on paper, lockers, notebooks and so on. Some people collect and trade stickers with other collectors. Temporary name tags are usually stickers. Stickers applied to guitars are called guitar decals. Post-it notes are removable stickers having glue on only part of the back, and are usually sold blank.