The Compton effect (also called Compton scattering) is the result of a high-energy photon colliding with a target, which releases loosely bound electrons from the outer shell of the atom or molecule. The scattered radiation experiences a wavelength shift that cannot be explained in terms of classical wave theory, thus lending support to Einstein's photon theory. Probably the most important implication of the effect is that it showed light could not be fully explained according to wave phenomena. Compton scattering is one example of a type of inelastic scattering of light by a charged particle. Nuclear scattering also occurs, although the Compton effect typically refers to the interaction with electrons.