What is Card ?
Card is (noun) 1. a flat piece of stiff paper with a picture on one side, which you can send with a message They sent us a card from Italy. How much does it cost to send a card to Australia? postcard 2. a piece of stiff paper, folded so that a message can be written inside 3. a piece of stiff paper with a picture or pattern on it, used to play games to put your cards on the table to reveal what you intend to do to play your cards close to your chest not to reveal what you intend to do on the cards fairly likely to happen 4. a piece of stiff paper with your name and address printed on it He gave me his business card. 5. a piece of stiff plastic used for payment Do you want to pay cash or with a card? credit card a plastic card which allows you to buy goods without paying for them immediately He paid for the hotel with his credit card.
source: Easier English, Student Dictionary Upper Intermediate Level