Security is an important factor of life, which varies from home network to all aspects of our life. Data security is one of the challenges research areas where we can’t provide 100% security for any data and network. Initially the data were secured with Passwords and extended up to biometrics, eventually attackers also becoming stronger to heal the data. In this paper critical review has been done starting from the passwords for securing data to various biometric methods. By using modern tool the data are securing using biometric methods.