Multi-factor authentication is an authentication method in which a computer user is granted access only after successfully presenting two or more pieces of evidence to an authentication mechanism: knowledge, possession, and inherence. Two Factor Authentication, or 2FA, is an extra layer of protection used to ensure the security of online accounts beyond just a username and password. Two-factor authentication (2FA), sometimes referred to as two-step verification or dual-factor authentication, is a security process in which users provide two different authentication factors to verify themselves. Two-factor authentication is one of the best ways to protect against remote attacks such as. Two Factor Authentication is an extra layer of security that requires not only a password and username but also something that the user has on them. But while those standards are still being adopted, the next best way to secure your accounts is two-factor authentication, or 2FA.