It was once the most high-tech and futuristic feature you could find: Transmit sound -- with light! Lasers! A cable not of copper, but glass! Except, it was almost never glass, and was usually ...

Optical audio cables, also known as TOSLINK cables, are essential for transmitting audio signals between devices in your home cinema setup. They are particularly useful for connecting older sound ...

There are only two ways to get digital audio between your TV and soundbar, or your TV and receiver, or really between any piece of gear that transmits audio in a home A/V system: HDMI and optical.