This educational work presents a new approach towards resonant interaction between classical light and matter. The interaction between light and matter is considered from three different points of view: the light picture (where the material degrees of freedom have been integrated out, and leaving one with scattering theory), the matter picture (where the radiative degrees of freedom have been eliminated and providing one essentially with atomic physics). In addition the polariton approach is discussed, in which the degrees of freedom of light and matter are treated on the same footing. Although the first approach will by far be given most of the attention, we will frequently emphasize the equivalence of the three methods. Much of the presented material is selfcontained.