High dynamic range or HDR is when you take a picture or watch a video and it looks super amazing with lots of details and colors. It's like when you go outside on a sunny day and you can see everything around you very clearly. HDR helps your pictures and videos look like that.
It works by capturing or displaying a wider range of brightness and colors than regular pictures or videos. You know how sometimes when you take a picture, the picture looks too dark or too bright in some areas? Well, HDR helps fix that by capturing more details in the bright and dark areas at the same time.
So when you're watching a video or looking at a picture with HDR, it will look more like what you would see with your eyes in real life. You'll see more bright colors and more dark shades, like you're actually there! It's pretty cool!