has upper (atrium) & lower (ventricle) chamber. The electricity goes from atrium to vetricle thru' a "cable " if you will.
In WPW there is an extra cable that send electricity a bit faster, so your ventricle may beat faster. Is like driving thru' a highway loop to by pass the slower traffic that goes thru' the city. Most WPW don't have symptoms, but is better if you see md for evaluation.