What are the differences between the HDMI versions?

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Currently, HDMI 2.0 products and cables are the mainstream in the market, mainly used for the transmission of 4K@60Hz HDR, while the new HDMI 2.1 is aimed at a higher-level communication for smooth audio/video transmission between equipments and better switching time, such as 8K/4K@120Hz/eARC/VRR/ALLM, etc.