Metaphysics is the branch of philosophy that examines the fundamental nature of reality, existence, and the universe. It was first studied by early Greek philosophers like Parmenides and Plato, but Aristotle is considered the founder of metaphysics as a distinct field. Metaphysics investigates questions about existence, consciousness, the beginning of the universe, and our place within it. It uses logical reasoning rather than empirical evidence. Metaphysics is foundational to philosophy and influences how we understand and interact with the world.