The Unique Identification Authority of India (UIDAI) is a central government agency of India. Its objective is to collect the biometric and demographic data of residents, store them in a centralised database, and issue a 12-digit unique identity number called Aadhaar to each resident. It is considered the world's largest national identification number project. Some civil liberty groups, like Citizens Forum for Civil Liberties and Indian Social Action Forum (INSAF), have opposed the project on privacy concerns.