Oledb: Drivers
For example, the Microsoft OLE DB Driver for SQL Server is a standalone API used to link applications to SQL Server databases. OLE DB vs. ODBC: Key Differences
From a technical standpoint, an OLEDB driver is a DLL that implements specific mandatory and optional COM interfaces. The core components of any OLEDB driver include: oledb drivers
The "Office" provider used for newer Access and Excel (.xlsx) formats. Why Use OLE DB Today? For example, the Microsoft OLE DB Driver for
Traditionally used for Microsoft Access databases and older Excel files. oledb drivers
A more versatile evolution that can handle relational data as well as non-relational data like directory services and Excel spreadsheets .
Microsoft and third parties produced a wide array of OLEDB drivers for different data sources. The most notable include:

