A CVV is the three- or four-digit number on your card that adds an extra layer of security when making purchases online or over the phone. This security code is printed on the credit card for additional fraud protection. It helps to ensure to that that the cardholder is in possession of the credit card. Different issuers have slightly different names and locations for them.

The Verification Code is a three-digit number on the back of your Visa credit card. The full credit card number is reprinted in the signature box and at the end of the number is the Verification Code.

The Verification Code is a three-digit number on the back of your MasterCard. The full credit card number is reprinted in the signature box and at the end of the number is the Verification Code.

The Verification Code is a three-digit number on the back of your Discover card. The full credit card number is reprinted in the signature box and at the end of the number is the Verification Code.

The Verification Code is a four-digit number on the front of the card above the credit card number on either the right or the left side of your American Express credit card.