HDR photography

1. What does HDR stand for?

-High-Dynamic-Range 

2. What is the idea behind an HDR image?

-HDR images can represent more accurately the range of intensity levels found in real scenes, from direct sunlight to faint starlight, and is often captured by way of a plurality of differently exposed pictures of the same subject matter.

3. What is exposure bracketing (you may have to click a link on the wikipedia to find this)?

-where the camera is set to capture the same image several times with different exposure settings, both over-exposed and under-exposed (lighter and darker) compared to the current setting on the camera

4. Can you do this with video?

--I donut know