A post card is generally made of thicker paper but a letter is a message on a paper sent through the mail.
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A letter is a written message on a piece of paper that is usually placed in an envelope for privacy, while a postcard is a card with an image on one side and space for a short message on the other, meant to be sent without an envelope through the postal system. Postcards are typically used for short, informal messages, while letters can be more detailed and formal.