What Is A CVV2/CVC2/CID Code?

 
For Discover, MasterCard, and Visa cards, the CVC2/CVV2 code is a 3 digit code at the end of your account number, printed on the back of your card, as shown in the picture below.

For American Express cards, the CID number may consist of 3-4 digits and is located on the front of the card, following the card number.