They act as hit points for the ship. Hits that aren't dodged drain the shields, then do hull damage when the shields are gone.
Thanks
So, shields have hit points. When you reduce them to zero, and only then, you start damaging the hull. Does this "hull damage" work like hit points too? or is it more like a critical hit table?
Edited: I just saw that FFG has the X-Wing rule book for free on the webpage.
So, in X-wing starships have two pools of hit points, shields and hull. You have to put down the shields before being able to damage the hull. The starship cannot suffer critical hits while the shields are up. When the shields are down, you start damaging the hull and the starship can suffer critical hits. Finally, in X-Wing there is no soak value (armour) for starships.
Edited by Yepesnopes