A parametric plot is specified by a list of three items;  the first two are real functions of a parameter, the third is the range for the parameter.

When used in conjunction with the option coords=polar, parametric plots produces polar plots.

Several parametric plots can be plotted on the same graph, by providing a set or a list of parametric plots as the first argument.  For more information, see plot.

$\mathrm{plot}\left(\left[\sin \left(t\right)\,\cos \left(t\right)\,t=0..\mathrm{\pi }\right]\right)$

$\mathrm{plot}\left(\left[x^2\,x\,x=0..3\mathrm{\pi }\right]\,-8..8\,-10..10\,\mathrm{coords}=\mathrm{polar}\right)$

$\mathrm{plot}\left(\left[\frac{t^2-1}{t^2+1}\,\frac{2t}{t^2+1}\,t=-\mathrm{\infty }..\mathrm{\infty }\right]\right)$

$\mathrm{plot}\left(\left[\left[2\cos \left(s\right)\,\sin \left(s\right)\,s=0..2\mathrm{\pi }\right]\,\left[\cos \left(t\right)\,\sin \left(t\right)\,t=0..2\mathrm{\pi }\right]\right]\,\mathrm{color}=\left[\mathrm{blue}\,\mathrm{yellow}\right]\right)$