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This website, doi.org, is the homepage for the Digital Object Identifier (DOI) system operated by the DOI Foundation. The DOI system is a not-for-profit organization that governs the Digital Object Identifier (DOI), a digital identifier used to uniquely identify objects, including physical, digital, or abstract items. The organization operates on behalf of registration agencies and provides services to various communities, such as those in construction, entertainment, standards, natural history collections, scholarly communications, and research data. The DOI system allows for persistent identification and tracking of objects and is used by humans and machines alike. The website includes information about the organization, its operations, the community of communities it serves, and the benefits and usage of the DOI identifier. It also features resources related to the DOI system and its foundation.