According to Article 7 of the Measures for the Supervision and Administration of Credit Card Business of Commercial Banks, credit cards refer to all kinds of media that record the relevant information of cardholders' accounts, have the functions of bank credit line and overdraft, and provide relevant banking services for cardholders.

Credit cards are generally plastic cards with a special carrier, with a length of 85.60 mm, a width of 53.98 mm and a thickness of1mm. The name of the card issuer, the expiration date, the number and the name of the cardholder are printed on the front, and the chip, magnetic stripe and signature strip are printed on the back. Cardholders can use credit cards to shop, spend money and deposit and withdraw cash from banks.