A postcard or post card is a rectangular piece of thick paper or thin cardboard intended for writing and mailing without an envelope. In some places, it's possible to send them for a lower fee than for a letter. Stamp collectors distinguish between postcards (which require a stamp) and postal cards (which have the postage pre-printed on them). While a postcard is usually printed by a private company, individual or organization, a postal card is issued by the relevant postal authority. The Unite… (More on Postcard)