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Biometrics deals with identification of individuals based on their biological or behavioral characteristics. Biometrics has lately been receiving attention in popular media, it is widely believed that biometrics will become a significant component of the identification technology as (i) the prices of biometrics sensors continue to fall (ii) the underlying technology becomes more mature, and (iii) the public becomes aware of the strengths and limitations of biometrics. This chapter provides an overview of the biometrics technology and its applications and introduces the research issues underlying the biometrics.