The document discusses different types of biometrics used to identify individuals, including fingerprints, handprints, iris scans, and signatures. It describes how biometrics systems work by automatically identifying people based on biological or behavioral characteristics. Some advantages of biometrics are that they cannot be lost, stolen, or forgotten like passwords. However, biometrics also have limitations like environmental factors affecting accuracy. The document also examines design considerations for biometrics systems and provides examples of current and potential future applications.