What is multifactor authentication (MFA)?

Multifactor authentication (MFA) is a security mechanism that enhances access control by requiring users to provide two or more different verification factors before granting access to an account or system. This method adds layers of security, making it more difficult for unauthorized individuals to gain access, as it necessitates not only something the user knows (like a password) but also something the user has (like a smartphone for a verification code) or something the user is (like a fingerprint).

By utilizing multiple factors of authentication, MFA mitigates the risk of compromised credentials, as gaining access to multiple types of verification typically requires a greater effort from attackers. This layered approach helps better protect sensitive data and systems from various cyber threats.

The other options present singular or more basic forms of security measures that do not align with the principle of multifactor authentication.