Security code

The security code on a credit card is the brief number that is printed on the card that helps verify its legitimacy. Depending on the card, the security code can be a three-digit or four-digit number, printed on either on the back of the card or the front, and goes by several names. The most common is CVV, which stands for “card verification value” code. Other card issuers call their security codes CVV2 (Visa), CVC2 (MasterCard) or CID (American Express).