Philosophy/fəˈlɑːsəfi/ Definition 1 of 4Pro Tip 1/3Academic Field Focuses on intellectual theories, not just practical ideas. My philosophy class covers theories about the nature of knowledge. Pro Tip 2/3Broad Discipline Includes ethics, politics, metaphysics, and logic. Philosophy is divided into many branches like political philosophy. Pro Tip 3/3Critical Thinking Requires analysis and questioning of beliefs. Philosophy trains you to examine your assumptions about the world.