'''Quantum electrodynamics''', or ('''QED,''') is a [[quantum field theory]] of [[electromagnetism]]. QED describes all phenomena exhibited by [[electric charge|charged]] point particles, such as [[electron]]s and [[positron]]s, and the particles of [[light]] ([[photon]]s), interacting by electromagnetism. This theory includes [[electrodynamics|classical electrodynamics]] in the limit of large fields, but also explains purely quantum phenomena such as the structure of [[atom]]s and [[molecule]]s, the creation of particles by an [[electromagnetic field]], and the anomalous magnetic moment of the electron. (The latter prediction has been experimentally confirmed to 11 decimal digits.)
QED was the first quantum field theory in which the difficulties of building a consistent, fully quantum description of fields and creation and annihilation of quantum particles were satisfactorily resolved. [[Sin-Itiro Tomonaga]], [[Julian Schwinger]], and [[Richard Feynman]] received the [[1965]] [[Nobel Prize in Physics]] for its development.
