Biometric refers to the measurement and statistical analysis of people's unique physical and behavioral characteristics. Common biometric identifiers include fingerprints, facial recognition, iris patterns, and voice recognition. These traits are used for identification and access control, enhancing security in various applications. Biometric systems work by capturing and analyzing these unique traits to verify an individual's identity. For example, a smartphone may use fingerprint scanning to unlock the device, while security systems in airports might employ facial recognition technology to identify passengers. This technology is increasingly used in everyday life for convenience and security.