CVV2 is an important security feature for credit card transactions on the Internet and over the phone. "CVV" stands for "Card Verification Value" and it is the three- or four-digit number printed in the signature space on the back of most credit cards and on the front of American Express cards, like this:
Some newer credit cards only show the last four digits of the credit card number on the back, followed by the CVV number.
The CVV number enhances fraud protection and helps to validate two things:
By helping to prevent credit card fraud, the CVV number keeps costs down for everyone.