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The credit card security code (CSC) is usually a 3- or 4-digit number, which is not part of the credit card number.
The CSC is typically printed on the back of a credit card (usually in the signature field).
Where do I find it?
Visa/Mastercard and Discover
Flip your card over and look at the signature box. You should see either the entire 16-digit credit card number
or just the last four digits, followed by a special 3-digit code. This 3-digit code is your CSC.
Look for the 4-digit code printed on the front of your card, just above and to the right of your main credit card
number. This 4-digit code is your CSC.