The security code is three digits long for Visa, Mastercard and Discover cards. These issuers have the security code on the back of your card, to the right of the signature panel.

A credit card security code provides protection against fraud in online and over-the-phone transactions.

Your credit card's security code is a three- or four-digit number that helps protect you against credit card fraud. Learn how to find it and why it's important.

A credit card CVV, or card verification value, is a three- or four-digit security code that appears on your credit card and is used to prevent fraud.