A URN, or Uniform Resource Name, is a permanent identifier for internet resources that is essentially a location-independent string of characters. It identifies every resource on the internet, regardless of its form, such as a website or email. URNs are defined namespaces assigned by a namespace authority, so they remain unique and persistent over time even after the resource they are attached to moves or ceases to exist

. In the context of the Aadhaar card in India, URN stands for Update Request Number, which is a 14-digit number issued to individuals when they apply to update their Aadhaar card details. It is used to track the status of the request to update Aadhaar card details