Card verification value (CVV) is for a security feature for 'card not present' payment card transactions. Merchants who require the CVV2 for 'card not present' payment card transactions as a security measure. CVV2 once the individual transaction is authorized, the card issuer not to store it.
The CVV number is an three or four digits code:
Example code: 037 319 0782 Here is a CVV number generator
The codes have different names: