The most commonly used is to facilitate self-identification. Of course, the main purpose is to check whether your signature and card are consistent when banks and merchants handle business. Many foreign banking businesses rely on signatures, so the signatures on this card should be carefully checked. In China, passwords are mainly used, and no one has the consciousness of checking signatures. Of course, the bank will check when necessary. Another important aspect is that your card has been stolen by others. If the signature on the label and the card is obviously inconsistent, the merchant can be held responsible.