What's the meaning of HDMI and History of HDMI

HDMI is the full name of High Definition Multimedia Interface, currently used in set-top boxes, TVs, laptops, game consoles, integrated amplifiers, digital audio and other devices.

HDMI is a digital video and audio interface technology that can transmit audio and video signals simultaneously.HDMI High Definition Multimedia Interface is a fully digital video and sound transmission interface that can send uncompressed audio and video signals.
HDMI interface can transmit audio and video signals, support 4K resolution and 3D visual effects, often found in laptops, computers, monitors, projectors, televisions and other devices. If there is a standard HDMI interface on the laptop and TV, then just with a HDMI cable, connect the two, you can make the laptop connected to the TV, the screen can achieve the effect of copying or expanding the use of the mode.

[The earliest HDMI version 1.0]
The earliest version of HDMI 1.0 was introduced in December 2002, and its most important feature is the integration of a digital interface for audio streaming, which is more advanced and convenient than the DVI interface that was popular in PC interfaces at the time. HDMI 1.0 version supports video streaming from DVD to Blu-ray formats and has CEC functionality. When applied, it creates a common liaison between all connected devices, making it easier to control an entire group of devices.

[HDMI 2.0]
After years of development, we now commonly used HDMI interface is mainly HDMI 2.0, its broadband expansion to 18Gbps, support for plug and play and hot plug and dial, support for 3840 * 2160 resolution and support up to 60Hz frame rate. It also supports up to 32 channels on the audio side, as well as up to 1536khz sampling rate. FYI: HDMI 2.0 does not define new cables and connectors, interfaces, so for HDMI 1.x, there is perfect backward compatibility.

[HDMI 2.1 supporting 8K]
And the latest HDMI 2.1 was introduced in January 2017, with a significant increase in bandwidth to 48Gbps, which can support up to 7,680 × 4,320/60Hz (8K/60p) images, or higher frame rate images at 4K/120Hz. It also supports the new Dynamic HDR technology, which ensures that every scene, even every frame, of a video shows the ideal values for depth of field, detail, brightness, contrast, and a wider color gamut than "static" HDR. For audio, HDMI 2.1 supports the new eARC technology, which delivers high bit rate 3D surround sound audio directly to the device.