This book is designed for students who are curious about the fascinating and complex world of particle accelerators. What cutting-edge physics and technologies power these incredible machines? What innovative ideas have shaped their evolution over the decades? And what exciting possibilities lie ahead for the future?For decades, particle accelerators have been at the forefront of both scientific research and industrial innovation. This textbook delves into the physical principles behind these machines, using intuitive illustrations and straightforward mathematical models.Written in an informal style, this book is aimed at graduate students without assuming prior knowledge of accelerators. Pure formalisms are avoided as much as possible to inspire readers and allow them to appreciate the fascinating physics that drives these state-of-the-art devices.To serve as a textbook, references are listed only on the more established original literature and review articles instead of the constantly changing research frontiers.This new edition features expanded sections to highlight material expected to be increasingly important in the future, along with revised sections for clarity and depth. Overall it is smoother, more reader-friendly, and enriched as a learning resource.