This page is a parametric curve plotter with animation.

You have only to enter two functions f (t) and g(t) defining the
parametric curve, with ranges of variation for t, x, y.
You will receive as reply an animated sequence showing the curve with a
moving point corresponding to the variation of the parameter t. This
variation of t is shown by a bar at the bottom of the figure,
synchronized with the point on the curve.

Some examples of parametric curves are at your disposal.