high key and low ket photography

high key- a style of lighting that is bright, even, and produces little contrast between light and dark areas of the scene.                               
   For high key photos there are alot of lights used infront and behind the person

low key-(of a photograph) having chiefly dark tones, usually with little tonal contrast ( distinguished from high key).
  For the low key photos the model is infront of a black or dark background with one light coming from an angle.