 Advertisers began to resurrect them as part of an overall integrated media strategy designed to reach highly mobile and 'hard-to-reach' youth markets.Trade cards and advertising postcards through the ages
While there are many different types of postcards, there are two broad types - those that are mailed to customers, possibly names drawn from a mailing list, and those that are distributed directly.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.