"Sophie’s World" is a novel by Jostein Gaarder that introduces readers to the history of philosophy through the eyes of a young girl named Sophie Amundsen. As she receives mysterious letters, Sophie embarks on a journey of self-discovery, exploring the ideas of famous philosophers from Socrates to Kant. The book combines a fictional narrative with educational content, making complex philosophical concepts accessible to readers of all ages. Through her adventures, Sophie learns about existential questions, the nature of reality, and the importance of critical thinking, ultimately leading her to question her own existence.