Okay kiddo, do you know how sometimes when we take pictures or watch TV shows, everything looks kinda dark or too bright depending on the lighting in the environment?
Well, high-dynamic-range television (HDR TV) is a type of technology that tries to fix that so the pictures we see look more like what we see in real life.
Imagine you're outside on a sunny day and you see a really pretty flower. The sun is shining really bright so parts of the flower might look too bright or washed out in a regular picture or TV show. But with an HDR TV, the picture will show the flower with more detail and color so it looks like you're really outside looking at it.
Basically, HDR TV helps the images on our screens look closer to what we see in real life because it can capture more colors and brightness levels than regular TV. It's kind of like having superpowers for your eyes when you watch TV!