Aadhaar is a 12-digit unique number which the Unique Identification Authority of India (UIDAI) will issue for all residents. The number will be stored in a centralised database and linked to the basic demographics and biometric information – photograph, ten fingerprints and iris – of each individual. The details of the data fields and verification procedures are available here.
Aadhaar will be:
Easily verifiable in an online, cost-effective way
Unique and robust enough to eliminate the large number of duplicate and fake identities in government and private databases
A random number generated, devoid of any classification based on caste, creed, religion and geography
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For more information visit : http://uidai.gov.in/