A simple demonstration of “SphericalPlot3D,” namely plotting a surface of constant radius and unconstrained Theta and Phi.

SphericalPlot3D[ 1, {theta,0,Pi}, {phi, 0, 2*Pi} ]

A slightly more interesting spherical coordinate plot, where radius depends on the polar angle (i.e., angle from vertical axis).

SphericalPlot3D[ Sin[Θ], {Θ,0,Pi}, {Φ, 0, 2*Pi}, AxesLabel->{"X","Y","Z"} ]