A CVV (Card Verification Value) and a CVV2 (Card Verification Value 2) both refer to the security code on your credit or debit card. The difference lies in the naming convention: CVV is the general term, while CVV2 specifically refers to the three-digit code on the back of Visa cards, introduced as an enhanced security measure. Both codes serve the same purpose of verifying that the person making the transaction has a physical card.