Quantum Electrodynamics (QED) is the quantum field theory of electromagnetic interactions.

In practice: it describes how charged particles and photons interact, and it has produced some of the most precise predictions in all of science.

[[Richard Feynman]] helped make the theory calculable and teachable through diagrammatic methods.

## See also
- [[Richard Feynman]]
- [[Photon]]
- [[Electromagnetic Radiation]]