Supplementary materials are additional resources that support the main content of a document, presentation, or educational course. These materials can include items like charts, graphs, videos, or articles that provide further information or clarification on the topic being discussed. They help enhance understanding and engagement by offering different perspectives or formats. In academic settings, supplementary materials often accompany textbooks or research papers. For example, a textbook might include online resources such as quizzes or interactive simulations to reinforce learning. These materials are valuable for both teachers and students, as they can cater to various learning styles and deepen comprehension.