Many major credit card issuers place credit card security code numbers on the back of your credit card. It’s usually a three-digit number, but American express uses four digits.

Other common names for it include Card Security Code (CSC), Card Verification Code (CVC or CVC2) and Card Identification Number (CID). Typically, you need this code when you're making a payment ...

CVV stands for card verification value. It’s a three- or four-digit number found on most debit and credit cards. There are several other acronyms for this security feature within the industry.