The primary function of a user authentication system is to verify the identity of users before granting access to systems or data. This process typically involves evaluating credentials, such as usernames and passwords, biometric verification, or security tokens. Effective authentication systems mitigate unauthorized access and enhance security by ensuring that only authorized individuals can utilize specific resources. In today’s digital landscape, these systems must balance security with user experience, employing methods like multi-factor authentication to enhance protection without compromising usability.