It is the use of the information model in the operational phase: the as-built model, completed with the data needed to operate and maintain the asset, becomes the geometric and information database to which maintenance, space management, energy and documents are linked. ISO 19650-3 governs information management in this phase; in Italian practice it is also called 7D BIM.
The value lies in continuity: the information gathered during design and construction is not lost at handover but passes to the operator in a form its systems can use.