DAO (Data Access Objects) is an application program interface (API) available with Microsoft's Visual Basic that lets a programmer request access to a Microsoft Access database. DAO was Microsoft's first object-oriented interface with databases. DAO objects encapsulate Access's Jet functions. Through Jet functions, it can also access other Structured Query Language (SQL) databases.
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To conform with Microsoft's vision of a Universal Data Access (UDA) model, programmers are being encouraged to move from DAO , although still widely used, to ActiveX Data Objects (ADO) and its low-level interface with databases, OLE DB. ADO and OLE DB offer a faster interface that is also easier to program.