An hdr stands for High dynamic range. What happens is that you take three photo's (preferably in high speed shooting). These three shots are a -2 exposure, normal exposure, and 2 exposure. I use photomatix pro 3.0 to stitch them all together to get a crazy looking shot. Last minute i made a HDR of me.
Now for this, i was bored and took it out of my car. I know it is only one shot but there will be more.