Data are everywhere. But what is the data revolution doing for the 700 million people who live in extreme poverty? When data are turned into valuable information, they have the potential to improve lives, transform economies, and help end poverty. Now more than ever, the world is facing new demands for data as our principal weapon in the war against COVID-19. The latest edition of the World Development Report from the World Bank provides a blueprint on how to harness the power of data for development, to ensure no one is left behind.