One of my pictures is lots of pictures
The benefits of using bracketing and multiple exposures
First off film and digital sensors aren't able to capture the range of light we see with our eyes. When you look at a raw image the shadows are often completely black or the highlights are blown out and completely white. This happens to every professional photographer regardless of how expensive their camera is. Advancements in software have made it easier to circumvent this limitation using multiple exposures (bracketing).
Bracketing involves taking the exact same picture at different shutter speeds to capture the full dynamic range of light. Shorter exposures will have shadows that are too dark while longer exposures will have blown out highlights. Digital processing techniques are used to blend all the images together to create a final picture with balanced shadows and highlights that wouldn't be achieveable with a single exposure.
Using Photoshop I blend bracketed images together to create a picture that has balanced shadows and highlights. It's like having three bowls of oatmeal; one is too cold, one is bland, and one is too hot. You then mix them in Oatmealshop to create one that's just right!