The CVV Number is the 3 Digit Number printed on the back of your credit card near the signature block. The 3 digit number is sometimes combined with the last 4 digits of your credit card number.

For Example:

1234 567
HERE WOULD BE YOUR SIGNATURE BLOCK

The first4 digits “1234″ would be the last 4 digits of your credit card.

In the Example, the “567″ would be the CVV Number.