Many people know that there is a cardholder's signature column on the back of bank cards and credit cards, but few people sign the signature column, and many people don't know the function of signature. In this regard, the staff of China UnionPay said that although the credit cards used by citizens every day have passwords, with the increase in the number of credit cards used, the risk of password leakage will increase accordingly. After the credit card and password are lost, checking "countersignature" becomes the last barrier to protect the security of the main credit card. Therefore, according to the relevant requirements, the cashier must check whether the cardholder's signature is consistent with the signature on the credit card. If they are different, the consumer transaction cannot be confirmed. It is an irregular operation for a merchant not to check the signature. Cardholders should also establish a sense of safe consumption of credit cards and consciously sign their names on the back of credit cards to prevent them from being stolen. The bank staff reminds you that in addition to verifying the "back signature" of the credit card when swiping the card in the mall to ensure the safety of the card owner, the bank staff can also check the signature on the back of the bank card with the signature on the register when citizens withdraw money from the bank ATM machine, so as to handle the card return business.