Dive deep into Quantum Field Theory with this essential physics textbook, designed for advanced students. Expertly linking classical mechanics and relativity to modern quantum concepts, it offers a uniquely self-contained pathway to gauge field theories. This rigorous yet accessible guide is perfect for undergraduate and graduate physics aspirants in India seeking a comprehensive understanding. Master complex principles through detailed derivations, pedagogical explanations, and practical worked examples. Build a strong foundation from advanced dynamics to the full theoretical framework of quantum and gauge fields.