A reference guide is a type of publication that provides information and guidance on a particular topic or subject. It typically contains detailed facts, data, definitions, and explanations to help readers understand complex concepts or find specific answers to their questions. Reference guides can take many forms, such as encyclopedias, dictionaries, manuals, handbooks, or textbooks, and are often used by students, researchers, professionals, or anyone who needs reliable information on a particular subject. The goal of a reference guide is to serve as a trustworthy source of knowledge that can be consulted for accurate and up-to-date information.