Originally Posted by
Fahrenheit531
A circle is most definitely not an ellipse.
Circle: All points equidistant from a single point.
Ellipse: All points equidistant from two points.
Put those two points close enough together and your ellipse may look like a circle, but it won't be. They are never, ever the same thing.
A circle is just an ellipse where the two foci are coincident. It's analogous to the statement "a square is a rectangle", because a square is just a rectangle with four equal sides.