A Card Security Code (CSC), also known as Card Validation Code (CVC2), Card Verification Value (CVV2) or Card Identification Number (CID) is a fraud prevention tool for Cardholder Not Present (CNP) payment transactions. In order to process a telephone or online purchase you will always be required by the merchant to provide your CSC number, since it serves as evidence that the person placing the order has physical possession of the card.
It is important to keep in mind that the code’s name, its position and its length are determined depending on the card company.