Microsoft Data Access Components are the key technologies that enable Universal Data Access. They include ActiveX Data Objects (ADO), Remote Data Service (RDS, formerly known as Advanced Data Connector or ADC), Object Linking and Embedding Database (OLE DB), and Open Database Connectivity (ODBC). Microsoft Data Access Components RTM contains core MDAC components, including additional OLE DB providers, and ODBC drivers for various data sources. It does not contain the MDAC SDK.