CVC (Card Verification Code) is an authentication procedure established by credit card companies to provide greater security for Internet transactions. Also known as CVV (Card Verification Value) or CSC (Card Security Code), this 3 or 4 digit code is different from the standard credit card number, and can be found on the front or back of the credit card depending on the type of card. By entering the code during online transactions, the card holder verifies that the card is currently in their possession, thereby reducing the risk of credit card fraud.