Aadhar card is a biometric-based 12 unique identity number that can be obtained by every citizen of India. This is 12 digits long so that each and every Indian citizen can be covered in this format.
Earlier there was no universal biometric-based easily available biometric identity card. Indian Passport was biometric-based but there were only a few people who were in the possession of Indian Passport. It was therefore very necessary for the country to have some popular and wide-based biometric identity so that Government services can be provided easily to the citizens of India.
Indians who do not possess an Indian passport can also receive aadhaar card, provided they stayed in India for more than 182 days immediately in 12 months.
In the same way, foreigners who those living in India for more than 182 days immediately in past 12 months, can also get this 12 digits unique identification number.
Aadhaar card is the largest biometric-based project undertaken all over the world.
As per the latest status, the Aadhaar card is proof of residence but possessing an Aadhaar card does not give any right to Indian citizenship.
Despite the validity cases in the court, Central Government is pushing Indian citizens to link Aadhar cards to Bank accounts, PAN cards, Provident funds,s, and other welfare schemes.
There is no doubt that now the Aadhaar card is so popular in India that on every step of proving identity it is becoming the most important document and without it, you will be in great difficulties.
Aadhar card is made in quite a professional way that it is not easy to get but also quite easy to update.
Aadhar card is now used by Indians in almost all the services provided by Govt of India and is also widely used as an Identity.
You may refer to How to download Aadhaar card on mobile