HDMI stands for High Definition Multimedia Interface, and it is an audio visual interface that can transport both uncompressed and encrypted digital audio and video streams.
HDMI is steadily gaining traction as the de facto standard for connecting digital audio and video sources.
An HDMI optical switch is a switch that supports optical audio over HDMI. It can be used to connect HDMI sources to your audio receiver that send digital audio.
Many consumer gadgets, such as high-definition flat-panel TVs, DVD players, set-top boxes, high-definition DVD players (Blu-ray and HD-DVD), AV receivers, and camcorders, now include HDMI connectors for a true digital experience.