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Microsoft Data Access Components ( MDAC; also known as Windows DAC) is a framework of interrelated Microsoft technologies that allows programmers a uniform and comprehensive way of developing applications that can access almost any data store. Its components include: ActiveX Data Objects (ADO), OLE DB, and Open Database Connectivity (ODBC).

A database management system is the software mechanism for managing that data. DBMS definition DataBase Management System: A software application system that is used to create, maintain, and provide controlled access to user databases.

The Access Database Engine(also Office Access Connectivity Engineor ACEand formerly Microsoft Jet Database Engine, Microsoft JET Engineor simply Jet) is a database engineon which several Microsoftproducts have been built. The first version of Jet was developed in 1992, consisting of three moduleswhich could be used to manipulate a database.

.ACCDT – The file extension for Access Database Templates. .ACCDR – is a new file extension that enables you to open a database in runtime mode. By simply changing a database's file extension from .accdb to .accdr, you can create a "locked-down" version of your Office Access database.