Aarogya Setu is an Indian mobile app developed to track COVID-19 cases and provide users information and self-assessment tests related to the virus. The app uses Bluetooth and location services to perform contact tracing to identify people who have been near infected individuals. While the app does not reveal personal user information, it does alert users if they have been in close contact with someone who later tests positive for COVID-19. The goal is to help prevent the spread of the virus through early identification and guidance to users.