(MDAC) Microsoft' s umbrella term for theIR {ActiveX Data Objects} (ADO), {OLE DB}, and {Open Database Connectivity} (ODBC) libraries. Together, these provide access to a variety of data sources, both relational (SQL) and nonrelational. MDAC is the technology that supports Universal Data Access, Microsoft' s strategy for providing access to information across the enterprise. . (2004-02-17)