Master data management (MDM) focuses on ensuring that the data that is most important to the organization is well defined. Master data is singled out from other data because the organization considers it mission critical. Master data is typically a small dataset that is uniquely defined throughout the enterprise. Commonly cited master datasets are for customer and for product. But master data can be any entity sufficiently important to an organization that needs to be succinctly defined. As such, it can be a dataset of locations, employees, events, statuses, facilities, or any other entity that the organization deems critical to define in the same way.