Multi-factor authentication (MFA) plays a crucial role in securing access to systems and data by adding an extra layer of security beyond just a username and password. This additional layer typically involves something the user has (such as a smartphone or security token) or something the user is (such as a fingerprint or facial recognition), making it significantly more difficult for unauthorized users to gain access.

By requiring multiple forms of verification, MFA reduces the risk of unauthorized access resulting from compromised credentials, such as stolen or guessed passwords. This significantly enhances the security posture of systems and data by ensuring that only authorized individuals with proper authentication factors can access them. As a result, MFA has become a cornerstone of modern cybersecurity strategies, especially in sectors where data protection is critical, such as finance, healthcare, and government.