The CCV of a credit card is also called the security code, which refers to the security code of the credit card when swiping the card for payment. The last three digits in italics at the signature on the back of the credit card are the CCV code. CCV can prove that the payer holds the credit card when making payment, which can avoid credit card theft. The ccv code of a credit card is equivalent to the credit card password. Credit card holders should pay attention to protecting the cvv code from being leaked.