Your iPhone’s Camera app offers all sorts of neat tricks for taking photos any environment. For most images, you can adjust the lighting and focus by tapping your iPhone’s screen; that may not be enough, however, when you’re snapping in very bright or very dark locations. That’s where your iPhone’s HDR (high dynamic range) feature comes in.
Why shoot HDR?
Without HDR, you get one of two things: either your subject is perfectly lit but the rest of the image is washed out, or the background of your photo is well-lit but the foreground is darker and slightly out of focus.