Biometrics means \"Life measurement\" but the term is usually associated with the use of unique physiological characteristics to identify an individual. The application to which most people associate with biometrics is security. A number of biometric traits have been developed and are used to authenticate the identity of a person. The idea is to use the special characteristics of a person to identify him. By using these special characteristics the authors mean using the features such as iris, face, fingerprint, signature etc.