The term HDR means high definition range. HDR means that your camera will process your photographs slightly differently than each other in order to expose the correct lights and darks in your final edit. Basically, a photo editing program will take several of your photos and merge them together based on their lights and darks.

This is a good example of an HDR photo that particularly takes my fancy:

I am impressed by this photo because everything is focused and clear in the picture. I really enjoy the contrast of orange and the green and can’t see a single flaw in the focus and exposure.