The function of biometric authentication in security systems is to provide a highly secure method of verifying an individual’s identity based on unique biological traits. Common biometric identifiers include fingerprints, facial recognition, iris scans, and voice patterns. By comparing the captured biometric data against a stored template, these systems can ascertain whether the person attempting access is legitimate. The increased accuracy and difficulty of replicating biological traits enhance security compared to traditional methods like passwords. Biometric authentication is increasingly used in various sectors, including finance, healthcare, and mobile devices, to protect sensitive information.