The CVV Code is an anti-fraud security feature to help verify that you are in possession of your credit card. The following images show where this can be found on each card type.
On a VISA card, the CVV is the last three digits printed in the signature box on the back of the credit card.
Just like with VISA, MasterCard has its CVV shown as the last three digits printed in the signature box on the back of the card.
As with VISA and MasterCard, Discover prints the CVV on the back of the card — the last three digits in the signature box.
American Express prints the CVV on the front of the card, above the credit card number on either the right or left side of the card. American Express CVVs are four digits long.