Digital Optical Audio Cables - Constructed of fibre optic cables and are capable of carrying multichannel audio such as PCM, Dolby Digital and DTS.
Optical cables use pulses of light instead of copper wire to transmit the audio data thus making them less prone to electromagnetic and radio-frequency interference. Optical cables are fitted with standard Toslink plugs, Toslink sockets found on audio and video equipment are small and square in shape and sometimes fitted with dust caps. Types of equipment where optical cables are commonly used include gaming consoles, DVD players, Blu-Ray Players, HDTV's, Computers, etc.
Optical cables will give you a marked improvement in sound quality over stereo / analogue installations and can reproduce movie soundtracks exactly as it was meant to be heard.