By using the Data Source Library, you can create several data sources that you can use to build your application.
Lists, document libraries, and XML files are all auto-enumerated data sources, so they appear in the Data Source Library without your having to explicitly add them.
When you create a list data source based on an auto-enumerated list, you can subsequently modify that list data source.
Creating a data source that points to an RSS feed or SOAP service is as easy as typing the appropriate URL and parameters into the Data Source Properties dialog box.
Linked data sources can be created to connect to data sources that otherwise would have to exist in separate data views on your pages.