The primary benefit of biometric authentication systems is their ability to provide a higher level of security compared to traditional password systems. By using unique physical traits, such as fingerprints, facial recognition, or iris patterns, these systems effectively verify user identity. This reduces the risk of unauthorized access and identity theft, as biometrics are harder to forge or replicate. Additionally, biometric systems enhance user experience by streamlining the login process, requiring no memorization of complex passwords while maintaining robust security.