Using Flash Diffusers and Reflectors

http://www.digital-photography-school.com/using-flash-diffusers-and-reflectors This article gave a general idea of what flash diffusers and reflectors are and what they do.  It mentions that diffusers help eliminate harsh light and shadows. They are sometimes built into external flashes.  Flash reflectors helps widen the affected flash area in a room.  The flash light would bounce off the reflector.