These three- or four-digit numbers provide an additional layer of security. Here is what you need to know about credit card security codes and how to find them by issuer.

A credit card security code provides protection against fraud in online and over-the-phone transactions.

What Other Information Is Needed Besides a Credit Card Security Code? More people are shopping online and using their credit and debit cards to pay for purchases.

A credit card CVV, or card verification value, is a three- or four-digit security code that appears on your credit card and is used to prevent fraud.

New security methods may be coming soon, including use of biometrics to authorize online payments and Visa passkeys in place of passwords or one-time codes.

A card security code is a three- or four-digit number on the back of credit and debit cards that ensures the authenticity of transactions when a physical card is not presented at the point of sale.