PulseWidthModulation (PWM) is just one of many forms of pulsemodulation.
It's often abbreviated PM and on the G2 shouldn't be confused with PhaseModulation (OscPM).

Here's the very basic pulsewidthmodulation patch:

The fun starts with selfmodding PWM. Against my own rules I added an LFO to the show. Tweak any knob, everything sounds great!