Meaning: Books can teach you about different cultures, histories, and ways of life, which can help you understand the world better.
Choice of Words: "Reading" is the process of looking at and understanding written or printed words. "Expands" means to make something larger or wider. "World" is the earth and everything on it. When you put these words together, you get the idea that reading can introduce you to new cultures, ideas, and perspectives, which can broaden your understanding of the world.