Biometric measurements are unique physical or behavioral characteristics used to identify individuals. Common examples include fingerprints, facial recognition, iris patterns, and voice recognition. These traits are difficult to replicate, making them reliable for security and identification purposes. Biometric systems capture and analyze these measurements to verify a person's identity. For instance, a smartphone may use fingerprint scanning to unlock the device, while security systems at airports might employ facial recognition to enhance safety. These technologies are increasingly used in various fields, including law enforcement, banking, and personal devices.