What are the different types of supplementary materials that can be included in a document, such as appendices, and how can they enhance the overall content and understanding of the main text?

Supplementary materials in a document, like appendices, can include charts, graphs, tables, and additional information that support the main text. They enhance understanding by providing more detailed data, explanations, or examples that may be too lengthy or complex to include in the main body. This extra information can clarify points, provide context, or offer further evidence to strengthen the arguments presented in the main text.