Get List Item Object (Interface Call) and Get List Item Object

Using Interfaces is one of the communication methods in the UE4. In this very case, the hint is the name, Get List Item Object Interface is an Interface children of the List View and Tile View widgets must implement.

The difference between Interface Call and Message is explained in the second part of the doc I mentioned above.

What is: Get List Item Object (Interface Call)
and Get List Item Object (Message)

Or better to say, what is User Object List Entry Interface?