Quantum electrodynamics (QED) is the branch of relativistic quantum field theory that deals specifically with the interactions between charged particles. It is widely used to solve problems in many areas of physics such as elementary particles atomic and molecular systems and solid state physics. This accessible text Basics of Quantum Electrodynamics supplies a solid foundation in this dynamic area of physics making a direct connection to the concepts of quantum mechanics familiar to the advanced undergraduate student. Chapters cover the general theory of free fields and the quantization of the scalar electromagnetic and spinorial fields which prepares readers for understanding field interactions. The authors describe the general theory of field interactions introducing the scattering matrix and the Feynman–Dyson graphs. They then discuss divergence-free second-order processes such as Compton and Møller scattering followed by divergent second-order processes which cover vacuum polarization and mass and charge renormalization. Providing a modern informative textbook this volume illustrates the intimate connection between quantum mechanics and QED in two basic steps: the quantization of free fields followed by the theory of their interactions. The text contains solved problems to facilitate the application of the theory as well as a useful appendix on the theory of distributions. The step-by-step description of the quantization of various fields and the clear presentation of the most important interaction processes in QED make this textbook a useful guide for those studying physics at both the graduate and undergraduate level as well as a reference for teachers and researchers in the field.