The postage stamp is a small and essential item used to affix on an envelope or a mail parcel to indicate payment of postage fee. It is also known as a postage label, mailing seal, postage mark, or postage token. However, there are many other synonyms that describe this little square, such as mail stamp, adhesive stamp, postal label, franking stamp, stamp, and label stamp. These synonyms are commonly used by collectors and philatelists to identify different types of stamps used in various countries, periods, or for specific purposes, such as commemorative stamps, definitive stamps, airmail stamps, and revenue stamps. Regardless of the different synonyms, the postage stamp is a vital tool for delivering mails around the world.