Metadata is structured information created to describe, explain, locate, or otherwise make it easier to retrieve, use, or manage an information resource. As an academic concept and research area, it investigates the principles, types (e.g., descriptive, administrative, structural), standards (e.g., schema like DataCite), creation, and application of such information, underscoring its fundamental importance for data discovery, interoperability, and long-term preservation across diverse domains.