Continuous light is ‘always on,’ as opposed to flash, which delivers a quick burst of light only when triggered.

key light –  Key lights highlight the form and dimension of on-screen subjects and allow the photographer to control the atmosphere of a scene.

reflected light – reflected light is light that reflects off the subject. This is most often what the camera records to make a photograph. Regardless of the light source, light is altered by whatever it reflects off.

back light – Backlight involves positioning the main light source for a photograph behind the primary subject.