The tires that you have on your bike will make determine that. Hybrids come in a variety of styles that put them between mountain and road bikes - the frame tends to be lighter than a mountain bike but heavier than a road bike, the fork can accommodate wider wheels than a road bike, and the geometry tends to be somewhat closer to a road bike (although I've seen some that resemble mountain bikes). It means your frame is versatile and can be adapted to different conditions and riding styles, but the tires on your bike will determine the types of terrain that you can actually go over.