An ellipse is the shape of the cross-section when a circular
cylinder is cut at an angle, or a circle is stretched in opposite
directions. Whenever a circular object, such as the rim of
a cup or saucer, is viewed from an angle the shape seen is
an ellipse, and an artist will draw it as such. It is also
the shape of the orbit of a satellite around the Earth.
ellipse is the path traced out by a point whose distance from
a fixed point, called the focus, maintains a constant ratio
less than one with its distance from a straight line not passing
through the focus, called the directrix.
Example of an Ellipse: