A PWM is Pulse-Width Modulation. It is a circuit board that is designed to regulate a duty cycle. They are usually used with train sets when you have that little box to control how fast the train goes. The board has a pot switch that can be adjusted to regulate the current going to a load. So the PWM with regulate how much power goes to the leds. This means that once wired up, you just turn the pot switch and can adjust the led brightness on the spot. And when you put the brakes on it will automatically make the leds bright. It's great because its a trusted system for the leds. Its great at regulating, easy to adjust, and just better for led setups when you do brakes and such.
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