What is Metaphysics?

Metaphysics includes big, abstract questions about the nature of reality that can’t be fully answered or investigated empirically: questions about whether or not we have free will and the nature of consciousness; about how objects or people persist through time. Are we the same people as we were as babies? Is a table the same if you inscribe your name into its surface? And what about causation, which is so central to our thinking, on what terms does one event cause another?