Two-factor authentication (2FA) is a security mechanism that enhances access control by requiring two distinct forms of verification from the user. Typically, this involves a combination of something the user knows (e.g., a password) and something the user possesses (e.g., a time-sensitive code sent to a mobile device or generated by an authentication app). By implementing 2FA, organizations significantly reduce the risk of unauthorized access and improve the overall security posture of their systems.