HDR also known as high dynamic range is an effect most digital camera have in order to add detail to images. On my phone there is an effect to use HDR which takes 3 images and mixes them together varying the exposure of each part of the image. This effect can also be added online using Photoshop which most photographers do.
The human eye can see approximately 11 stop and therefore when a photographer spots a chance for a photography, the fact a camera only see's roughly 5 stops (can vary) can be a difficulty. I have attached some HDR images:
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