The primary benefit of using multi-factor authentication (MFA) is its enhanced security for accessing sensitive systems and data. MFA requires users to verify their identity through multiple methods, such as a password combined with a biometric scan or a one-time code sent to their mobile device. This additional layer of security significantly reduces the risk of unauthorized access, even if credentials are compromised. By implementing MFA, organizations can protect sensitive information and safeguard against data breaches and cyber threats, ultimately fostering a more secure environment for users and businesses.