An ellipse usually looks like a squashed circle (in fact a circle is a special kind of ellipse).

An ellipse is made by a point P moving around so that the sum of the distances from two other points (F and G) is constant.

It is one of the "Conic Sections"

An ellipse is made by a point P moving around so that the sum of the distances from two other points (F and G) is constant.

It is one of the "Conic Sections"

See: Conic Section