Card Verification Code is a 3 or 4 digit security code printed on your credit card. We use this code to increase the security of online transactions.
Visa and Master Card
In Visa and Master Card, the 3-digit code is located on the back of the card of the card, inside the signature area. Typically the signature panel will have a series of numbers, but only the last three digits make up the CVV code.
In an American Express Card, the CVV is a 4-digit code located on the front of the card, printed above the card number. The code may be located on the right or on the left of the card, but is always above the card number.