The Aadhar Card is a government issued document as a part of the Universal Identification System. You can use the Aadhar Card for a variety of purposes such as opening a bank account or as a proof of your identity. To get your own Aadhar card, you can approach the nearest Aadhar Enrollment Centre (online appointment systems are available for some Aadhar Enrollment Centres). To get an Aadhar card you need a document as a proof of identity, proof of residence and proof of birth.
You should be careful about who you share your Aadhar card details with becasue they include sensitive information about you.