There are two main ways to use credit cards, one is signature mode and the other is password mode. Using signature mode requires signing after the merchant swipes the card, which is relatively safer. Password mode requires the cardholder to enter the corresponding password, which is relatively more convenient to use. Different banks and merchants have different usage rules, but generally speaking, cardholders can choose between signature mode and password mode according to their own habits and needs.

Whether in signature mode or password mode, cardholders should be vigilant when using credit cards and pay attention to their credit card security. For the signature method, cardholders should carefully check and confirm that they are signing their own names to prevent others from using them falsely. For password mode, cardholders should choose complicated passwords that are difficult to guess, and don't disclose passwords to others. If the credit card is abnormal, you should contact the bank to report the loss or freeze it in time.