Digital or Electronic Governance relates to the utilisation of Information and Communication Technologies for achieving better digital services to citizens, enhance transparency and collaboration, and promote evidence-based decision making in the public sector. Along these directions, the talk presents the methods, the tools and the solutions that structure the main generations of Digital Governance. Starting from the introduction of computers in the public sector and reaching the emerging applications of artificial intelligence and other exponential technologies, the talk covers the benefits and the challenges for decision makers, from a technical and administrative viewpoint.