A credit card security code is a three- or four-digit code that’s unique to your card. In case a merchant asks, the security code goes by a few different names, mainly the: ...

CVV stands for card verification values and is a security code usually found on the back of your credit card. Your CVV will be three or four digits long and will be required to make online ...

Then they say they need to verify you have the card and ask for the 3-digit CVV code (Card Verification Value) on the back. - That’s the key they need to start making real charges on your account.