Definition: HDMI

(High-Definition Multimedia Interface) A very popular digital interface for audio and video that provides a single-cable solution for connecting a computer to a monitor. HDMI technology is also widely used to connect home theater equipment such as TVs, Blu-ray/DVD players, cable boxes and Apple and Roku media hubs. Introduced in 2002, one HDMI cable took the place of nine different analog audio and video cables. HDMI is a trademark of HDMI Licensing Administrator, Inc.

HDMI technology supports eight channels of 24-bit uncompressed audio at 192kHz and up to 12K video as of HDMI 2.2. HDMI technology also provides copy protection, A/V equipment control, 5 volts of power and compatibility with DVI and DisplayPort interfaces.

HDMI Specifications
See HDMI versions and HDMI cable types. For HDMI copy protection, see HDCP. For A/V control, see HDMI CEC. For DVI compatibility, see HDMI-DVI compatibility. To turn a TV into a home theater hub, see HDMI ARC.

Common 19-Pin Connectors

Type A is for TVs, home theater equipment and monitors, while camcorders use Type C and D. A more secure Type E is used in vehicles, and a 29-pin Type B supports dual-link DVI resolution (see DVI).

HDMI vs. All the Others

This earlier Roku streaming hub was on the market during the transition stage from analog to digital TV. See A/V ports.

An HDMI Switch

This HDMI switch lets three HDMI sources plug into a TV with only one HDMI input. See HDMI switch. (Image courtesy of Oppo Digital, Inc.)