MasterCard SecureCode is a simple and secure way to pay at thousands of online stores.
A private code known only to you and your bank, your SecureCode enhances your existing MasterCard account by protecting you against unauthorized use of your card when shopping online at participating online retailers.

The aim and objective of Verified by MasterCard SecureCode is to create a level of consumer trust and confidence in online shopping similar to that in the physical shopping environment.
It is designed to improve both cardholder and merchant confidence in Internet purchases as well as reduce disputes and fraudulent activity related to the use of MasterCard payment cards.

To know more visit the following URL:
http://www.mastercard.com/us/personal/en/cardholderservices/securecode/index.html