Aadhaar is the world's largest identity project that enrolled a billion residents. alongside Nandan Nilekani, the author led a brilliant team in developing the technology that undergirds Aadhaar, enrolled the Resident population of India, created an online authentication mechanism for the digital world, and operationalize the ecosystem to take advantage of the new identity. This book is a first-hand account from the trenches which provides a lucid and in-depth understanding of the artefact called Aadhaar and how it continues to change and redefine India.