This book introduces QFT for a reader with no prior knowledge of the subject. It is meant to be a textbook for advanced undergraduate or beginning postgraduate students. The book discusses quantization of fields, S-matrix theory, Feynman diagrams, calculation of decay rates and cross sections, renormalization, symmetries and symmetry breaking. Some background material on classical field theory and group theory, needed for the exposition, are also presented in the book. Detailed calculations of weak and electromagnetic processes are included. There are many exercise problems to help the students, instructors and beginning researchers in the field. The second edition improves upon some notations and explanations, and includes answers to selected exercises.

Preface to the Second Edition / Preface to the First Edition / Preliminaries / Classical Field Theory / Quantization of scalar fields / Quantization of Dirac Fields / The S-matrix expansion / From Wick expansion to Feynman diagrams / Cross sections and decay rates / Quantization of the electromagnetic field / Quantum electrodynamics / P, T, C and their Combinations / Electromagnetic form factors / Renormalization / Symmetries and symmetry breaking / Yang-Mills theory of non-Abelian gauge fields / Standard electroweak theory / Useful Formulas / Answers to Selected Exercises / Index

Advanced Undergraduate and Postgraduate Students