An envelope sticker is a type of adhesive label that is used to seal envelopes. It is usually made of paper or plastic and is printed with a design or message. The term 'STAMP' is often used interchangeably with envelope sticker, as it is a five-letter word that can be used to describe the same item. Envelope stickers are commonly used for decorative purposes, such as to add a personal touch to a letter or package. They can also be used to indicate the sender's address or to provide additional information about the contents of the envelope.