HDR imaging uses tonal information contained in multiple exposures of the same shot to create very intense, expressive images when combined together. Some even border on surreal. It's much more technical than that, and basically too difficult for me to get shots to later merge that are exactly the same, even using a tripod. When I stack them together there's ghosting that then needs removed, and in the end, I tweak the image anyway.
So, for me, it's much simpler creating fake HDR in Photoshop, using one image that I pull two exposures from, and then merging them after removing unwanted areas from each image. This is followed by adding more saturation and texture layers.
Attached are a few that I worked on yesterday and today. I'm loving bright colors this time of year. Especially since we've had so much rain and I'm craving the sunshine!
The bird below was more about saving a badly exposed photo than creating faux HDR :-)