Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The card security code (CSC), sometimes called Card Verification Data (CVD), Card Verification Value (CVV or CVV2), Card Verification Value Code (CVVC), Card Verification Code (CVC or CVC2), Verification Code (V-Code or V Code), or Card Code Verification (CCV) are different terms for security features for credit or debit card transactions, providing increased protection against credit card fraud.These codes should not be confused with the standard card account number appearing in embossed or printed digits. (The standard card number undergoes a separate validation algorithm called the Luhn algorithm which serves to determine whether a given card's number is appropriate.)

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