Card Security Code (CSC, also commonly known as CVV) is an anti-fraud security feature to help verify that you are in possession of your credit card. For Visa/Mastercard/Discover, the three-digit CSC number is printed on the signature panel on the back of the card immediately after the card's account number. For American Express, the four-digit CSC number is printed on the front of the card above the card account number.

Visa/Mastercard/Discover American Express
Visa
A 3-digit number in reverse italics
on the back of your credit card
AMEX
A 4-digit number on the front, just
above your credit card number

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