However, HDR10 is and will continue to be for the time being the most widely recognized and used Dynamic HDR available across all platforms

HDR10 works by applying one set of HDR rules across the entire movie or episode, where as Dynamic HDR can change settings and HDR rule sets from scene to scene, thus the word Dynamic

As stated above, HDMI 2.1 introduces dynamic HDR by HDMI to TV's, however, LG is the only major TV company (not sure on Vizio) that has a leg up on the competition by having the Dolby Vision HDR chip embedded on 2016, 2017, 2018 models

Another change is the introduction of "Active HDR", which is supposed to improve HDR10 sources and mimic the dynamic properties of how dynamic HDR works

X, Quick Media Switching, and the ability to play Dynamic HDR through HDMI

Where as current HDR TV's are only able to play HDR10 through HDMI (I'll talk on LG in a bit), this HDMI 2.1 allows for Dynamic HDR to be played by HDMI sources