SQL Server Native Client (ODBC)
SQL Server Native Client (SNAC) is not supported beyond SQL Server 2012. Avoid using SNAC in new development work, and plan to modify applications that currently use it. The Microsoft ODBC Driver for SQL Server provides native connectivity from Windows to Microsoft SQL Server and Microsoft Azure SQL Database.
ODBC is a standard definition of an application programming interface (API) used to access data in relational or indexed sequential access method (ISAM) databases. SQL Server supports ODBC, via the SQL Server Native Client ODBC driver, as one of the native APIs for writing C and C++ applications that communicate with SQL Server.
SQL Server programs that are written using the SQL Server Native Client ODBC driver communicate with SQL Server through C function calls. The SQL Server-specific versions of the ODBC functions are implemented in the SQL Server Native Client ODBC driver. The driver passes SQL statements to SQL Server and returns the results of the statements to the application.
The SQL Server Native Client ODBC driver complies with the Microsoft Win32 ODBC 3.51 specification. The driver supports applications written using earlier versions of ODBC in the manner defined in the ODBC 3.51 specification.