Which authentication method involves multiple forms of validation for user identity?

Multifactor authentication involves the use of multiple forms of validation to confirm a user's identity, enhancing security. This method typically combines something the user knows (like a password), something the user has (like a mobile phone or hardware token), and something the user is (like a fingerprint or facial recognition). By requiring two or more of these factors, multifactor authentication significantly reduces the risk of unauthorized access, since gaining access would require compromising multiple authentication channels.

In contrast, single-factor authentication relies solely on one method, usually just a password, which can be easily compromised. Token-based authentication utilizes specific tokens but doesn't necessarily involve multiple forms. Biometric authentication, while a strong form of security, is still considered a single factor of authentication unless it's used in conjunction with other methods. Therefore, multifactor authentication stands out as the most effective method for securely validating user identities.