These codes are an extra security measure for online credit card transactions, allowing the bank that has issued the card to check the identity of the holder and thus prevent possible fraud, because the CVV and CVC are not present on the magnetic strip of the card.
The name and the position of the security code on the card varies according to the credit card circuit and the issuing bank.
The CVV (Card Verification Value) is a four-figure number that appears on the back of the credit card, above the card number. Mastercard, Visa
The CVC (Card Verification Code) is a three-figure number, the last 3 digits of the number on the back of the credit card. It appears in the space for the holder's signature.