Biometric authentication, derived from the Greek words for life and measure, utilizes unique individual traits such as fingerprints, facial recognition, and voice patterns for identification. This technology offers benefits including enhanced security, reduced identity fraud, and eliminates the need for passwords, making identification efficient and reliable. The growth in biometric applications is projected to reach 770 million downloads annually by 2019, with an eventual market of 4.8 billion biometric devices by 2020.