CVV stands for Card Verification Value. It is the 3 to 4 digit number on the back of your credit card, typically found beside the signature box. It acts as a security code to protect your credit card against fraud. Never confuse your CVV number with your 4 digit Personal Identification Number (PIN), they are not the same. When you make an in-store purchase at a point-of-sale machine, you will often be asked to enter your 4 digit PIN number. However, the CVV is used for online purchases. The CVV protects you against fraud by confirming your credit card is legitimate, belongs to you, and is in your possession.