The essence of this technical and highly conceptual book is inherent in its capacity to render Quantum Field Theory accessible to an as wide a circle of readers as possible without compromising the theory's physical and mathematical rigour. Not only will this book, for that matter, be of interest to research physicists and to graduate students of physics, it will also be of interest to undergraduate students of physics and to the non-academic but interested, discriminating and dedicated readers. Whereas all other technical books and textbooks address either the experts, or the graduate students in Quantum Field Theory, the conceptual analysis in this book addresses all readers: From academic professionals, especially those researchers who are active in other fields (condensed matter physics, atomic and laser physics, quantum mechanics, mathematics, chemistry, computer science, engineering, etc.), to the non-academic readers who may not be literate in mathematics and physics but have a capacity for conceptual abstraction and are willing to consistently apply it in order to understand Quantum Field Theory.