The word "card" in the Russian language is derived from the phrase "open letter", that is, this word indicates correspondence type, which can be mailed without an envelope. In this sense, can be called only by postcard postcard strictly defined size, conforming to international standard post-105 * 148 mm. Now, however, the cards are called not only postcards, greeting cards but also a variety of designs and sizes, as well as other types of greetings, without any relation to the post or to printing: Virtual e-greetings-flash-cards and souvenirs in the form of cards - for example , air-Cards
