A "Compendium of Knowledge" is a comprehensive collection of information on various subjects, often organized in a systematic way. It serves as a reference tool, summarizing key concepts, facts, and insights across disciplines such as science, history, and literature. These compilations can take many forms, including books, databases, or online resources. They aim to provide readers with a broad understanding of topics, making complex information more accessible. Examples include encyclopedias and textbooks, which are designed to educate and inform users about the world around them.