Which term refers to a Visa card's unique check value used for validation during transactions?

The term that refers to a Visa card's unique check value used for validation during transactions is CVV, which stands for Card Verification Value. The CVV is a three-digit number located on the back of the card (or four digits on the front for American Express) that serves as an additional security measure to verify that the person making the transaction possesses the physical card. It helps reduce fraud in card-not-present transactions, such as online purchases, by providing a layer of validation beyond just the card number and expiration date.

Understanding the CVV's role is important for maintaining security in electronic transactions, especially as cyber threats continue to evolve. Familiarity with this term is essential for professionals in the payments and financial services industry, as it directly impacts transaction credibility and consumer protection.