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A growing number of developing countries are using biometric technologies to create national identification programs or for more specific needs, including cash transfers, voter registration, and disaster relief. CGD’s research shows how biometric ID can help improve public service delivery, advance progress on many of the Sustainable Development Goals, and helps shape global best practice in applications that use the technology. Our work on India’s pioneering Aadhaar system aims to understand how it has impacted a billion Indian lives, and how the technology could be useful to other developing countries.