This stands for Data Source Name. The DSN sets up the ODBC driver database connection. It includes the following information: database name, directory, database driver, UserID, password, and other things. Each DSN connects to a specific database and calls the information from its database.
The name of a data source that applications use to request a connection to the data source. For example, a data source name can be registered with ODBC through the ODBC Administrator program.
Data Source Name. The logical name used by ODBC to refer to the drive and other information required to access data. The name is use by Internet Information Server for a connection to an ODBC data source, such as a SQL Server database. To set this name, you double-click ODBC in the Control Panel.