When shopping in the supermarket, he asked me to sign my credit card. If you don't sign, you won't brush. I don't even have the right to sign my own card
It's not that you like to sign cards, but that credit cards can only use your own signature. People didn't make this suggestion for the safety of your card. If the signature on the back of the credit card doesn't match the signature on your consumption bill anywhere, the bank will stop your card first and check your personal information again. Only when all the inspections have passed can it be used normally.