This textbook provides the first comprehensive overview of synchrotron physics at an introductory level, covering the fundamental underpinning physics, and combining rigorous treatment of the main concepts with a fresh outlook, rich in images and graphics.Aimed at students and practitioners alike, this book describes all topics in a way that requires only undergraduate knowledge in physics and mathematics, and, with only a few exceptions, all results are derived from first principles. The book also emphasizes the relevance of the synchrotron-light concept throughout the broader fabric of physics, covering areas such special relativity, classical electrodynamics, quantum theory, astrophysics, optical physics, classical mechanics, and computational physics.As well as basic concepts related to the generation of synchrotron light by charged particles in accelerators and their special relativity and classical electrodynamics underpinning, this textbook also covers quantum mechanical and quantum optics descriptions of synchrotron light emission, the key role played by synchrotron light emission in the cosmos, and the generalisation of the concept of synchrotron emission to interactions other than the electromagnetic interaction.Taking the reader on a journey across the landscape of physics, this book aims to unite a number of often-disconnected communities of learners and practitioners through the connecting thread of synchrotron light.