This document provides an overview of philosophy and key philosophers. It defines philosophy as the study of fundamental questions about existence, knowledge, values, reason, mind, and language. It discusses important ancient Greek philosophers like Pythagoras and Plato. It also explains the difference between holistic and partial thinking. Philosophy allows one to gain a broad perspective on life by developing reflective thinking skills to evaluate decisions and viewpoints. The need to philosophize stems from experiences, doubt, and wonder. It concludes by discussing branches of philosophy and the value of philosophical reflection.