What is the purpose of multi-factor authentication (MFA) in IAM?

The purpose of multi-factor authentication (MFA) in Identity and Access Management (IAM) is to strengthen authentication by requiring users to present two or more independent factors from different categories: something you know, something you have, or something you are. This layered approach significantly reduces the risk of unauthorized access, even if one factor—such as a password—is compromised.

MFA addresses common attack techniques such as phishing, credential stuffing, and brute-force attacks. For example, even if an attacker steals a user’s password, they would still need access to the user’s hardware token or biometric factor to authenticate successfully.

MFA does not simplify access, remove authentication, or grant unrestricted access. Instead, it deliberately increases verification requirements to improve security. NIST SP 800-63 and other security frameworks strongly recommend MFA for privileged accounts, remote access, and cloud services because of its proven effectiveness in preventing account compromise.