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Metadata is data that provides information about other data. It describes the characteristics of a resource, such as its creation date, author, file size, and content type. Metadata can be used to organize, find, and manage data more effectively. It helps users understand the context and origin of the data, facilitating its retrieval and interpretation.

There are different types of metadata. Descriptive metadata identifies a resource and explains its content. For example, a book's metadata might include its title, author, and a brief summary. Structural metadata describes how a resource is organized, such as the order of pages in a book or the relationship between different parts of a dataset. Administrative metadata provides information to help manage a resource, such as its creation date, access rights, and preservation information.

Metadata is crucial in many fields. In libraries, it's used to catalog books and other materials. In digital photography, metadata can store information about the camera, settings used, and location. The internet relies heavily on metadata for search engine optimization and web browsing. Databases also use metadata to define the structure and content of their tables. The quality and consistency of metadata directly impact the usability and accessibility of the data it describes.