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A Digital Object Identifier (DOI) is a character string consisting of a prefix and a suffix (e.g. DOI: 10.1000/123456) that uniquely identifies a digital object, such as a journal article or a dataset. The identifier permanently refers to the assigned object. DOIs make it easier to find and cite research data and link datasets to other publications. In RADAR, each published dataset is automatically assigned a DOI, which is registered with the global organization DataCite.