Credit card fraud is a 52.8 BILLION dollar industry so its no surprise that there are lots of tools available that are designed to prevent credit card fraud. The Card Verification Value (CVV2) is the 3 digit code on the back of the credit card (4 digits on the front of AMEX cards). The 3 or 4 digit code is designed to add an extra layer of credit card fraud protection although many experts question its effectiveness. Knowing what the code is for and how the code is used can be a big help.