Philosophy is often described as the discipline that seeks wisdom and answers. As we begin to question, the door to philosophy opens wide. It inspires us to explore the existence of the unseen, and the process of exploration is the journey towards the truth.This book has carefully compiled hundreds of philosophical facts, encompassing philosophical schools, great philosophers, and philosophical theories. To facilitate readers’ ease of use, each major direction is further divided into domestic and foreign branches. Both branches cover a wide range of philosophical thoughts from ancient to modern times.The writing in this book is plain and straightforward, explaining profound philosophical ideas in an accessible manner. It is hoped that this book will enable young readers to gain a deeper understanding, love, and attention for philosophy.