Philosophy is a field of study that includes diverse subfields such as aesthetics, epistemology, ethics, logic, and metaphysics, in which people ask questions such as whether God exists, what is the nature of reality, whether knowledge is possible, and what makes actions right or wrong. The fundamental method of philosophy is the use of reasoning to evaluate arguments concerning these questions. However, the exact scope and methodology of philosophy is not rigid. What counts as philosophy is itself debated, and it varies across philosophical traditions.