Aadhar Card is issued to Indian citizens by the Unique Identification Authority of India (UIDAI) making it possible for the government of India to have a common identification of all citizens. This is e-Aadhaar Pdf Download done by collecting and storing the biometric and details of citizens in a unique identification number database. The Aadhar Card contains the 12-digit unique identification number that is generated by the UIDAI making it possible to identify all the citizens of India.