A compendium is a concise collection of information or a summary of a larger work. It often includes essential details, key concepts, and important facts, making it easier for readers to grasp complex subjects quickly. Compendiums can cover various topics, such as science, history, or literature, and are useful for students, researchers, and professionals. These documents can take many forms, including books, articles, or digital formats. A well-known example is the Compendium of Materia Medica, which is a classic Chinese medical text. Compendiums serve as valuable resources for anyone seeking a quick reference or overview of a specific subject.