A postcard a small print used to convey information or share travel experiences.。It usually made of cardboard or cardboard，Smaller size，Usually 10.5 cm × 14.8 cm。Postcards usually have a pattern printed on one side、scenic、Illustrations or photos, etc.，There a blank space on the other side for writing letters.。People can write greetings on postcards、thank、Congratulations or share your travel experiences，Then deliver it by mail or directly to the recipient。Postcards are also often used as travel souvenirs or collectibles。They have simplicity、Portable and easy to deliver，It a common way of cultural communication

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