HDMI is the abbreviation of High-Definition Multimedia Interface.
HDMI connects digital audio/video sources such as a set-top box, an HD DVD disc player, a Blu-ray Disc player, a PC, video game console,
or an AV receiver to a compatible digital audio device and/or video monitor such as a digital television (DTV).
HDMI makes an uncompressed digital RGB (Red, Green, Blue) connection from the source to the screen. By eliminating conversion to an analog signal, it delivers an unblemished image.
The non-degraded signal reduces flicker and leads to a clearer picture. HDMI intelligently communicates the highest output resolution with the source device.
The HDMI input is fully backwards compatible with DVI (Digital Video Interface) sources but includes digital audio. HDMI uses HDCP copy protection.
The picture below shows a HDMI cable:
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