This text offers an accessible introduction to the central questions of Western philosophy and how the major philosophers and philosophical movements have explored them. This book takes the reader through such questions as: what can we know for certain about the world or ourselves?; can we prove the existence of God?; how is the mind related to the body?; what does it mean to be moral or immoral?; what is justice?; and how should society be organized? Questions such as these are central to how we think about the world and form the core of philosophy. The book explains the key ideas, for example, metaphysics and existentialism, in a straightforward way. It is appropriate for someone meeting the subject for the first time, in school or college.