The Terms Enum Filter (Aggregator) uses an enum as a base and resolving the enum translation to display in the filter. In comparison to IDs, enums are constant identifiers, usually defined as readable text and not large number-character-combinations. Enums in Picturepark are collection types or share types. The explanation for enums on Wikipedia: It is used by Picturepark for Collection filters or Share filters, so get the Enum and show a specified translation.