This document discusses biometric technology systems. It defines biometrics as using personal characteristics like fingerprints to authenticate or identify individuals. Biometric systems work by collecting data to create templates that can then be used to quickly verify identities by comparing to large databases. Biometric systems are used for applications like law enforcement, government services, and enterprise because they provide convenient, reliable and fast identification compared to traditional methods. The document also outlines the history of biometrics, common types of biometrics like fingerprints and facial recognition, and advantages and disadvantages of biometric systems.