I love when books include appendices because they add so much depth to the story. For example, in 'The Lord of the Rings,' the appendices provide background on Middle-earth's history, languages, and cultures, which makes the world feel more real. They’re like hidden treasures for curious readers who want to dive deeper. Appendices can also clarify complex themes or offer additional context, like maps or family trees. I recently read 'Dune,' and the glossary in the appendix was a lifesaver for understanding all the unique terms. It’s like getting bonus content that enriches the main narrative without disrupting the flow.