ABDM, formerly known as NDHM, is Ayushman Bharat Digital Mission which aims to create a unified digital health infrastructure in India. It consists of several facets including a health ID called ABHA card, health facility registry, health professional registry, and software vendors. ABDM uses interoperability standards like FHIR and NRCES to allow seamless exchange of health data between different systems. It specifies several digital health documents that can be exchanged such as diagnostic reports, discharge summaries, prescriptions, and more. ABDM provides a health ID card called ABHA which can be generated through various means including Aadhaar. It is not just for smartphone users and aims to benefit all Indian citizens.