An advertising postcard is a postcard used for advertising purposes (as opposed to a tourism or greeting postcard). Postcards are used in advertising as an alternative to or to complement other print advertising such as catalogs, letters, and flyers. Advertising postcards may be mailed or distributed in other ways.
Though postcards have traditionally always been rectangular in shape, some postal authorities, such as Canada's Canada Post Corporation, may allow non-rectangular shaped cards to be mailed. This has given rise to new marketing concepts such as round postcards or cards specifically die cut to match the theme of a particular campaign.
Freecards are usually distributed by display on stands with patrons being encouraged to take them for free.