In the world of computer science & information technology security is essential and important issue. Identification and authentication techniques plays an important role while dealing with security and integrity. 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. Biometrics is the science and technology of measuring and analyzing biological data of human body, extracting a feature set from the acquired data and comparing this set against to the template set in the database.