The CVV Number ("Card Verification Value") aka CVV / CVV2 / CSC / CID, on your credit card or debit card, is a 3 digit number on VISA®, MasterCard® and Discover® branded credit and debit cards.
The American Express® branded credit or debit card has a 4 digit numeric code.
CVV / CVV2 / CSC / CID code is provided as a service to all credit card and debit card holders.
Security codes for different card types: