The discourse surrounding digital transformation in the public sector has moved beyond aspiration, as governments increasingly adopt advanced technologies to gain competitive advantages in operational efficiency and public service quality. This transformation is not a matter of digitizing existing processes. Rather, it demands a fundamental reimagining of institutional structures and the dynamics of public engagement. This book investigates the evolving terrain of digital governance, shaped by the mainstreaming of digital-by-default platforms and the integration of artificial intelligence into public functions. Drawing on diverse theoretical perspectives and empirical case studies spanning both the Global South and Global North, the chapters offer a multidimensional view of how digital transformation unfolds across institutional, cultural, and technological contexts. With contributions grounded in public value theory, collaborative governance, and AI design frameworks, this volume advances a critical and forward-looking dialogue on governing in the digital age. By bridging conceptual clarity with real-world practice, it offers scholars and practitioners with actionable insights for shaping inclusive, adaptive, and citizen-centered governance in a rapidly changing technological landscape.