https://arstechnica.com/gadgets/2021/12/the-hdmi-forum-follows-the-usb-if-in-using-new-version-numbers-to-refer-to-old-ports/

If you dabble in high-end 8K TV equipment or own one of the newest Xbox or PlayStation consoles, you might be familiar with HDMI 2.1. The latest version of the ubiquitous display spec adds variable refresh rate support, reduces latency, and offers a big bandwidth increase that allows for higher resolutions, higher refresh rates, and greater color depth. At least, it can support those things.