An Appendix (Supplement) is a section at the end of a book, report, or 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. This helps readers understand complex topics without interrupting the flow of the main narrative. The appendix is often labeled with letters or numbers, such as Appendix A or Appendix 1, to make it easy for readers to reference. It serves as a valuable resource for those seeking more in-depth knowledge about specific aspects of the subject matter discussed in the main sections.