Quantum electrodynamics (QED) is a branch of theoretical physics that studies the interaction between light and matter at the quantum level. It is a quantum field theory that describes the behavior of electromagnetic fields and their interaction with charged particles, such as electrons and positrons.

In quantum electrodynamics, photons are the carrier particles of the electromagnetic force and are responsible for interactions between charged particles. The theory describes how photons are emitted and absorbed by charged particles, and how they exchange energy and momentum. Quantum electrodynamics is able to explain many phenomena related to the behavior of light and matter, such as the interaction of light with atoms, the scattering of light by electrons, and the Lamb shift of atomic energy levels. It is also an important element of the Standard Model of particle physics, which describes fundamental particles and their interactions.

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