Theoretical Physics . Volume 4. Quantum electrodynamics by the great Soviet physicists Lev Davidovich Landau and Yevgeny Mikhailovich Lifshitz is not just a textbook, but a real encyclopedia of knowledge that immerses the reader in the world of quantum electrodynamics, one of the most complex and exciting areas of physics. This volume is part of the famous multi-volume course that has become a classic in theoretical physics and continues to inspire students, graduate students and researchers around the world. The book covers a wide range of topics, ranging from the foundations of quantum theory to complex aspects of the interaction of light and matter. Landau and Lifschitz masterfully explain key concepts such as the photon, the interaction of particles and fields, and relativistic quantum mechanics. They not only expound the theory, but also offer many examples and tasks, which makes the material more accessible and understandable. The reader will be able to see how abstract concepts turn into real physical phenomena, which makes the study of quantum electrodynamics fascinating and informative. This book will be interesting not only for students of physics, but also for those who are fond of natural sciences, mathematics and philosophy of science. It is suitable for both beginners and more experienced readers seeking to deepen their knowledge in the field of theoretical physics. If you are a physics student, a graduate student, or just a science lover who wants to understand how the world works at the most fundamental level, then “Theoretical Physics . Volume 4. Quantum electrodynamics” will become an indispensable source of information for you The topics raised in the book go beyond purely scientific questions. Landau and Lifschitz touch on the philosophical aspects of science, exploring how quantum electrodynamics changes our perception of reality and the nature of light. Questions about how observation affects particle behavior, the nature of reality, and what “time” and “space” are in the context of quantum theory make this book not only a textbook, but also a philosophical reflection on our place in the world. The style of the authors is distinguished by clarity and logical presentation, which allows the reader to easily follow the course of thought. Landau and Lifschitz are known for their ability to explain complex concepts in a simple and accessible language, making their work particularly valuable to students and faculty. Their other known works, such as "Theoretical Physics. Volume 1. Mechanics" and "Theoretical Physics. Volume 2. Electrodynamics" are also noteworthy and are important parts of the general course of theoretical physics. Theoretical Physics . Volume 4. Quantum Electrodynamics is not just a textbook, but a key to understanding one of the most exciting and challenging areas of science. It opens the door to a world where laws are different from our usual ones, and makes us think about how our world works. If you are looking for a deep but accessible explanation of quantum electrodynamics, this book will be your reliable companion on this fascinating journey.