One Point and Two Point Perspectives

One point perspective is defined as a drawing that has a single vanishing point, usually directly opposite to the viewer's eye and that is usually on the horizon line.

Two point perspective is defined as a drawing with one set of parallel lines to the picture plane and two sets oblique to it. (The parallel lines that are oblique to the picture plane converge to a vanishing point, which means that this set-up will require two vanishing points.)