Input parameters for Find Path to Location Synchronously

Development Programming & Scripting Blueprint
1

I’m studying the navigation system in Unreal Engine 4.7.3.
Experimentally, I made a blueprint as below.

789f4d5dcb05f20587df68197b27608304cc8e48.jpeg
789f4d5dcb05f20587df68197b27608304cc8e48.jpeg1650×867 226 KB

It works fine.
A Find Path to Location Synchronously node has input parameters, Pathfinding Context and Filter Class.
I’m not sure what these parameters do.
Please tell me how to use them?

Thanks