This document discusses the definition and branches of philosophy. Philosophy comes from the Greek words "philos" meaning love and "sophia" meaning wisdom. It is defined as using human reason to study the first causes or highest principles of things through natural light of reason and unaided by other sciences. The main branches of philosophy are metaphysics, which studies existence; ethics, which studies morality; epistemology, which studies knowledge; and logic, which studies reasoning. The document also discusses why philosophizing through wondering and reflection is important to gain a holistic perspective.