Generally a postcard is accepted as a 6inch by 4inch - or A6 (148.5mmx105mm) - card which is thick enough to go through the post. It is printed with a picture on one side, and the other side printed to indicate space for an address and message. Many years ago the postage rate for a postcard was less than that for a letter - especially if the message was restricted to "five words of conventional greeting". This may still be the case in some countries, but it is generally accepted that postcards travel through the mail by third class service. Holidaymakers wishing their cards to reach their friends before they themselves return home will pop them in an envelope, and send them through the letter-post service. As such they become (in our mind anyway) a correspondence card.
A correspondence card is similar to a postcard, but does not always meet our definition given above. The difference being that the reverse of a correspondence card is entirely plain (which makes it cheaper to produce) or is personalized with an address, or maybe only has the address on one side with a plain reverse. It is generally expected that a correspondence card would be put into an envelope before posting.
A publicity card is the same as either of the above, but produced for promotional purposes, and possibly with a fair bit of information on the back. These are very effective ways of marketing a product.
Whatever the definition - we at BusyCards can produce them in all sizes, with plain backs, or full colour on both sides.
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In addition to supplying a variety of cards that can work for you, we can offer these related services, please enquire by e-mail