Biometric systems enhance security protocols by using unique physical characteristics for authentication. Common biometric identifiers include fingerprints, facial recognition, and iris patterns. These systems provide a higher level of security compared to traditional methods like passwords or PINs, which can be forgotten or stolen. Biometric authentication is more difficult to replicate, making unauthorized access substantially harder. The technology is increasingly employed in various applications, from unlocking smartphones to securing sensitive facilities, fostering trust in security measures.