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Simply so, what is an ODBC DSN?
A data source name (DSN) is a data structure that contains the information about a specific database that an Open Database Connectivity ( ODBC ) driver needs in order to connect to it. User and system DSNs are specific to a particular computer, and store DSN information in the registry.
how do I find my DSN?
Click the Windows "Start" button and then click "Control Panel." Click "System and Security." Click "Administrative Tools" in the list of utilities. Double-click the icon labeled "Data Sources (ODBC)." A list of DSNs display. Click the DSN you want to test. Click the "Configure" button on the right side.
Data Source Name (DSN) provides connectivity to a database through an ODBC driver. The DSN contains database name, directory, database driver, UserID, password, and other information. Once you create a DSN for a particular database, you can use the DSN in an application to call information from the database.