Final answer:
Appendices and supplementary sections contain supporting materials not included in the main text. These materials provide nonessential information or contextual background and can include feature boxes, visuals, and outside learning resources.
Step-by-step explanation:
Materials that support but are not readily incorporated into the text of a document are typically found in appendices or supplementary sections. These include nonessential information that might be of interest or provide additional context but are not critical to the main argument or narrative of the document. Elements like feature boxes, visuals, and links to learning resources can help support the text.
Documents may include various sections that provide essential details to back up the main points, such as facts, statistics, or examples, to ensure the reader gains a complete understanding of the topic covered. In academic writing, it is also important to check if each paragraph supports the thesis with sufficient and relevant evidence. Furthermore, whether to include additional media like figures or charts depends on how these could enhance the reader's comprehension of the text.