What is the role of metadata in information retrieval?

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Metadata provides the descriptive information about a resource that makes it easier to find, access, and organize. It includes details like the title, author, date, and keywords, plus technical and administrative facts such as file format, language, and rights. In information retrieval, this structured data acts as a concise guide that search systems index and that users quickly scan to judge relevance. Because metadata captures essential attributes of the resource, it enables precise searching by specific fields (author, subject, date), supports filtering and facet navigation, and helps teams and systems group related items through shared keywords or classifications. While a URL might be included in metadata for access, the core role is descriptive—facilitating discovery and organization—rather than storing the full text or dictating citation format.