the cardholder's signature on the back of the credit card. Most credit cards have the words "signature" written on the back. You can sign your name at the cardholder's signature on the back of the credit card after the cardholder applies for a credit card, so the credit card contract is signed at the cardholder's signature on the back of the credit card. The advantage of signing a credit card is that it is convenient for the cashier to check the signature when swiping the card, ensuring the safety of using the card and protecting the safety of personal information.