A unique name used to create a data connection to a database using open database connectivity (ODBC). The data source name (DSN) is used by applications that need to access or manage data in the database.
All ODBC connections require that a DSN be configured to support the connection. When a client application wants to access an ODBC-compliant database, it references the database using the DSN.
Graphic D-7. Data source name (DSN).
You can configure a DSN for an ODBC-compliant database using the Microsoft Windows NT ODBC or the Windows 2000 Administrative Tools\Data Sources (ODBC) utility in Control Panel. You can create three kinds of DSNs:
When you design Web applications that use Microsoft ActiveX Data Objects (ADO) for accessing database information, be sure to use either a file DSN or a system DSN because ADO does not work with user DSNs.