Biometric systems are technologies that identify individuals based on unique physical or behavioral traits. Common biometric identifiers include fingerprints, facial recognition, iris patterns, and voice recognition. These systems are widely used for security purposes, such as unlocking smartphones or accessing secure facilities. The main advantage of biometric systems is their ability to provide a high level of security, as it is difficult to replicate someone's unique traits. However, concerns about privacy and data security arise, as biometric data can be sensitive and vulnerable to hacking. Overall, biometric systems are becoming increasingly prevalent in various sectors, including law enforcement and banking.