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

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 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.

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.