Credit card security code.

CVV is usually called the credit card security code. It is printed on the card surface of the credit card. It is usually the last 3 digits of the signature line on the back of the credit card. Some CVV codes are 4 digits.

Different types of credit card security codes are printed in different locations. This CVV is equivalent to the credit card's ID card. Credit card holders can use the credit card security code to conduct consumer transactions. When people make transactions over the Internet or over the phone, they can make payment transactions using their credit card's card number, expiration date, and security code.