Exposure bracketing is a technique used to create a HDR (high dynamic range) photo at the end of a shoot.
It is used in low lighting, and done by taking around three of the same images, but with different exposures in each. One over, one under and one normally exposed.
I experimented with this one my shoot as the light was low.
This meant I could use the photo with the best light, and determine how to edit my final image.