What does quantum electrodynamics?
The quantum electrodynamics called so because it unifies quantum physics and the electromagnetism (the latter being the unification of electricity and magnetism. In short, quantum electrodynamics “to describe all the phenomena of the physical world, except for gravitational effects, and radioactive phenomena. That is to say that all phenomena involving light and matter are explained by this theory, explaining, among other things, the interactions between photons (light) and electrons (matter), hence the book title. This may seem abstract, but in reality, all phenomena that you know are from interactions between photons and electrons (except the gravity and radioactivity). These include all optical phenomena, but also biology and chemistry. Phenomena that may seem simple and explained that you thought were long in fact been definitively explained by quantum electrodynamics as the mere reflection and transmission of light in a glass slide that Feynman explains beautifully in the context
