Metaphysics is a branch of philosophy concerned with explaining the fundamental nature of being and the world, although the term is not easily defined. Traditionally, metaphysics attempts to answer two basic questions in the broadest possible terms:
1. "What is there?" and
2. "What is it like?"
A person who studies metaphysics would be called either a metaphysicist or a metaphysician. The metaphysician attempts to clarify the fundamental notions by which people understand the world, including existence, the definition of Object (philosophy), Property (philosophy), space, time, causality, and possibility.
A central branch of metaphysics is ontology, the investigation into how each category of being in the world relates to each another.