Amazon Web Services (AWS) Multi-Factor Authentication (MFA) is a simple best practice that adds an extra layer of protection on top of your user name and password. With MFA enabled, when a user signs in to an AWS website, they will be prompted for their user name and password (the first factor—what they know), as well as for an authentication code from their AWS MFA device (the second factor—what they have). Taken together, these multiple factors provide increased security for your AWS account settings and resources.
AWS MFA is available via Virtual MFA Device, Hardware Key Fob MFA Device or Hardware Display Card MFA Device. The video below provides instructions for each option.
For more information visit: http://aws.amazon.com/iam/details/mfa/