What aspect does "two-factor authentication" primarily enhance in access control?

Two-factor authentication (2FA) plays a crucial role in enhancing security in access control by requiring users to provide two different forms of identification before granting access. This process significantly strengthens the security framework, as even if one form of authentication, such as a password, is compromised, the second factor—often something the user possesses (like a mobile device or security token)—remains an additional barrier against unauthorized access.

By integrating multiple verification methods, two-factor authentication mitigates the risk of security breaches that can arise from weak passwords or phishing attempts, making it a vital aspect of modern security protocols. This multilayered approach ensures that the individual attempting to gain access is legitimately who they claim to be, thereby reinforcing the integrity of the access control system.