postcard，Small font for conveying information or sharing travel experiences.。It usually made of cardboard or cardboard，Smaller size，Usually 10.5cm×14.8 cm。Postcards usually have a pattern printed on one side、Scenic one、Illustrations or photos, ETC.，There a blank space on the other side where you can write a letter.。People can write greetings on postcards、thank、Congratulations or share your travel experience，Then delivered by post 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 exchange

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