I know I can look up everything on Wikipedia but sometimes I would like a person's take on what something is.
But thanks for the link anyway. 
Sundogs are fascinating. I don't think I have seen one in rl.
I was born and raised in a woody area, and never saw one there.
When I was 18, and living in a flat, I saw the first sundog of my life. It was extremely bright. So bright that there was no rainbow effect on the sides. It looked like a sun.
I was opening the door for a visitor of my flatmate, and suddenly I saw two suns. They looked equally bright. So, I blurted out, look, there are two suns.
The guy I opened the door for happened to be a meteorologist. So, he explained what it was, and said this was a very bright one indeed. In Dutch the name is "bijzon", translates best as "sun on the side" or "extra sun" I think.
Now that I live in an area with less trees, and more sky to see, I see them quite often. Most of the time they are weak though. And, sometimes they do come with a full ring around the sun.
