The Player's Handbook describes the different damage types on p. 196; the corresponding portion of the basic rules is here.
The PHB describes Force damage in such a way that it seems to be a solid magical manifestation that strikes your opponent in such a way to deal damage. But what separates this from bludgeoning damage?
How would I describe force damage to my players in a way as to justify that it bypasses a creature's bludgeoning damage resistance, but a normal bludgeoning attack doesn't?