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HDMI, or High-Definition Multimedia Interface, is a standard for transmitting high-quality digital audio and video signals between devices like computers, monitors, and TVs. It is a single-cable solution that replaces older analog connections and allows for high-definition content, such as 4K video, and advanced features like 3D, and audio return channels (ARC).

Key features and functionalities

Audio and video transmission: HDMI combines both audio and video signals into a single cable, simplifying connections.

High-definition support: It supports a wide range of resolutions and refresh rates, including 4K video at 60Hz.

Audio formats: It can carry advanced audio formats, such as Dolby TrueHD and DTS-HD Master Audio.

Audio Return Channel (ARC): Introduced in version 1.4, this feature allows audio to be sent back to a receiver or soundbar from the TV, reducing the need for extra cables.

CEC (Consumer Electronics Control): This feature allows you to control multiple HDMI-connected devices with a single remote control.

Compatibility: HDMI is backward-compatible with DVI, and can be adapted to work with other formats like VGA, DisplayPort, and USB-C through converters and adapters.