HDMI 2.1 is the most recent update of the HDMI specification and offers a number of significant new features and bandwidth capabilities to support higher resolution displays and faster refresh rates.
HDMI 2.1 introduced support for Display Stream Compression (DSC) 1.2a, a visually lossless compression algorithm with a compression ratio of up to 3:1. VESA DSC 1.2a can be used for HDMI 2.1 applications to achieve display resolutions beyond 8K60/4:2:0/10-bit color, such as 8K60 RGB, 8K120, and even 10K120.