Biometrics is a method of establishing a person’s identity based on chemical, behavioral, or physical attributes of that person, and is relevant in large-scale identity management across a wide range of applications. In addition, this technology can be implemented to regulate access among computer networks, financial transactions, or transportation systems. The main purpose of biometrics in these applications is to determine or verify someone’s identity in order to prevent unauthorized people from accessing protected resources. Unlike code- and password-based systems or access card systems, which rely on information that can be forgotten or items that can be lost, biometrics techniques provide access based on who people are rather than what they have in their possession.