The primary purpose of user authentication systems is to ensure secure access to resources by verifying the identity of users. These systems employ various methods, such as passwords, biometrics, or multi-factor authentication (MFA), to confirm that individuals are who they claim to be. By enforcing authentication protocols, organizations can protect sensitive information and prevent unauthorized access, which is crucial for maintaining data security and privacy. Consequently, effective user authentication is essential in safeguarding against threats like data breaches and identity theft.