Postal cardA postal card is a typically rectangular piece of thick paper or thin cardboard intended to write on and be mailed without an envelope and at a lower rate than a letter. It is distinguished by stamp collectors from a postcard in that the postage is pre-printed on it whereas a postcard requires a stamp. A postal card is issued by a stamp-issuing authority (typically a country) whereas a postcard is usually printed by a private company, individual or organisation.
In the Art-world the postcard can also be transferred into an art-object. The artform where this is done is called mail art.