Master Data Management (MDM) platforms establish and maintain authoritative records for core business entities — customers, products, suppliers, locations, employees, accounts. Core capabilities include multi-source entity matching and deduplication (rule-based and ML-driven), survivorship rules that reconcile conflicting field values across sources, hierarchy management (e.g., corporate parent-child relationships), data-stewardship workflows for human review of low-confidence merges, reference-data management (country codes, currency, industry classifications), and cross-system ID resolution with outbound sync. The category spans traditional enterprise MDM (Informatica, Tibco) and modern cloud-native entrants. Leading vendors include Informatica MDM, Reltio, Profisee, Stibo Systems, Ataccama, and Semarchy.