In today's internet world the need for automated security system is critical and challenging issue. The biometric can play a major role in maintenance of information security and authentication in computing systems. The computing system requires reliable authentication and recognition of individual for confirming the identity. A biometric system recognizes an individual based on his/her physical or behavioral features which are unique. By using biometrics we can verify that the users are in fact who they claim to be. In this paper we compare and discuss various biometric traits and techniques.