The Altium Designer has schematic symbol library and PCB footprint library. I understand both of these. However, there is a third one called pad via library.
Pad is the exposed copper on PCB where a component is soldered. It could be a SMT pad or a through hole pad. Via on the other hand is a hole in the PCB whereby a PCB track can go from one layer to another.
That is all there is to know about pad and via isn't it? Then why would anyone need to create a library of these? This is new to me.