Can someone explain to me what the relationship is between the Resistance, the Republic, and the First Order? From what I understand, the First Order is the remnants of the Empire and the Resistance is the new Rebel Alliance. How does the Republic play into this (or did, considering they got obliterated)? The First Order destroyed the Republic with the Starkiller Base because they were supporting the rebels, but they supposedly had a substantial fleet of their own.
Was the Resistance a third faction or more like a terrorist group in the eyes of the First Order?