How to use an object data source?

I want to create a project that uses a Data Source object instead of a Database connection.  I go into the datasource configuration wizard, and when I select 'Object', I am then brought to a window that wants me to select the assembly where the object is located.  What type of object needs to be in my project in order to select an object?  I've tried selecting a class that contains properties for a table, and that seems to work, but I'm still not certain if this is correct.  Could you please explain how this works?  Thank you in advance.