An appendix is a section at the end of a document that provides additional information to support the main content. It can include data, charts, graphs, or detailed explanations that are too lengthy to include in the main text. Appendices help readers understand complex topics without interrupting the flow of the main narrative. In academic writing, appendices are often used to present supplementary materials, such as research findings, surveys, or interview transcripts. Each appendix is usually labeled with a letter or number (e.g., Appendix A) and referenced in the main text, allowing readers to easily locate the additional information.