I'm working on an assignment in my Algebra II class right now, and my teacher wants me to examine the definition of the loci of a circle and the loci of an ellipse. Then describe at least 3 similarities in the definitions and, describe at least 2 differences in the definitions.

I'm so confused, I have read the chapter on it up and down and watched the video she gives us for help.. I'm so confused, help?

Even if you could point me in the right direction, please.