In last decade, many real world applications were developed based on unimodal biometric systems. Generally it is used for identifying human's physiological characteristic like face, fingerprints, and thumb for person verification. Biometric provides a solution for security, where unimodal systems have significant limitations due to sensitivity to noise, intraclass variation, non-universality, Spoof attacks, and other factors. To improve the performance of matchers in such various situations may not prove to be highly effective. Multibiometric systems seek some of these problems by providing multiple pieces of evidence with same identity and help to increase the performance which may not be possible in singlebiometric indicator. Aadhar card is a best idea to check the authenticity of a person, which is more secure and identical. This paper presents the limitations of biometric and proves the privacy and security of an Aadhaar card.