The entire point of the unique identifier is, as the name suggests, to create a unique code to specify each record in a database or collection. Having this unique identifier allows a user to disambiguate records, create specific searches, link records and more. However, creating a unique identifier can be a little more complicated. A unique ID can be as simple as a number that has no relation to the record or object. In other cases the ID can hold information relating to the object ranging from accession number to date and subject information.