The High-Definition Multimedia Interface is a digital audio and video interface able to transmit uncompressed streams. It is used in both consumer and professional devices from television sets, to set-top boxes, camcorders, to games consoles, Blu-ray Disc players… and more. It replaces a big pile of lumpy analog connections such as SCART, composite video, as well as DVI, audio and more. In 2013, 10 years after the specification was released, over 3 billion HDMI devices had been sold.

Type A standard 19-pin – very widely used.
Type B 29-pin not used yet but ready for large video formats such as WQUXGA (3,840×2,400).
Type C is a mini version of Type A, intended for mobile devices.
Type D is a micro version, even smaller than Type C.
Type E is the Automotive version with a locking tab and a shell to keep water out.

The Version 1.1 specification supports a maximum pixel clock rate of 165 MHz, sufficient for1080/60P and WUXGA (1920×1200) and 8-channel 192 kHz 24-bit audio as well as compressed streams such as Dolby Digital. The current HDMI 1.3 offers 340 MHz capability – beyond WQSXGA (3200 x 2048) – and offers future proofing.

The data carried on HDMI is encrypted using High-bandwidth Digital Content Protection (HDCP) digital rights management technology – meaning that the receiving end needs to be able to decrypt HDCP.