There is a three-digit credit card verification code on the back of the credit card, which is also a security code. CVC (abbreviated as CVC in English, full name CardVerificationCode) is an additional code printed on the back of the credit card, also known as CVV (CVV), which is the credit card verification value, also known as CID, which is the credit card security code or personal security code, etc., all names refer to the same Verification code