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According to encyclopedia.com, quantum electrodynamics is the quantum field theory that describes the properties of electromagnetic radiation and its interaction with electrically charged matter in the framework of quantum theory. Now, to me, that is still complete jumble, so I will dissect and simplify. Quantum field theory is simply the study of the quantum mechanical interaction of elementary particles and fields. Elementary particles (electrons, protons, neutrons, quarks, etc.) are the most basic physical constituents of the universe, and fields are regions throughout which a force may be exerted. Electromagnetic radiation is the energy radiated in the form of a wave as a result of the motion of electric charges. Quantum theory is the modern physical theory concerned with the emission and absorption of energy by matter and with the motion of material particles. Therefore, QED is the theory that describes h