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The term biometric comes from the Greek words bios (life) and metrikos (measure). It is the study of physical or behavioral characteristics used for the identification of a person. The term Biometrics is becoming highly important in computer security world. The human physical characteristics like fingerprints, face, hand geometry, voice and iris are known as biometrics. These features are used to provide an authentication for computer based security systems. By using Biometrics a person could be identified based on "who she/he is" rather than "what she/he has" (card, token, key) or "what she/he knows" (password, PIN). An attempt has been made in this interesting as well as informative Booklet to include Timeline History (in a Tabular form) and to focus on the various Types of Biometrics, Advantages, Disadvantages and their Applications in various Fields along with several relevant Illustrations. … Dr.H.K.Saboowala.