CVV is usually called the credit card security code, which is printed on the card face of the credit card, usually the last 3 digits of the signature column on the back of the credit card, and some CVV codes are 4 digits.

Different types of credit card security codes are printed in different locations. This CVV is equivalent to a credit card ID card, and credit card holders can use the credit card security code for consumer transactions. When people make transactions through the Internet or telephone, they can make payment transactions through the card number, expiration date and security code of the credit card.