This course explores the emerging phenomenon of "digital public infrastructures" (DPIs). These efforts -- which typically consist of technologies for identity management, payments, and data exchanges -- have been heralded as critical infrastructure for the twenty-first century economy. DPIs have the potential to spur innovation and economic development and to change the relationship between citizens and the state. The course will examine India's digital stack, which is among the most prominent and well-developed, but will take a global and comparative approach, discussing similar emerging systems in China, the EU and USA.