CVV is an anti-fraud security feature to help verify that you are in possession of your credit card.

Visa - three-digit CVV2 - Card Verification Value The CVV2 is the last 3 digits after the credit card number on the back of the card in the signature area.

MasterCard - three-digit CVC2 - Card Validation Code The CVC2 is the last 3 digits after the credit card number on the back of the card in the signature area.

Discover - three-digit CID - Card Identification The CID is the last 3 digits after the credit card number on the back of the card in the signature area.

A 3-digit number in reverse italics on the back of your credit card