What (in simple terms) is ?

There are a few people here who think they have strong when others think it might be their polr or another weak function. Perhaps we need to re-look at what really is and what it is not to clarify issues a bit?

Can we also have some examples of how the polr manifests itself in INFps/ISFps?

P.S this is a general topic about so that we can share our understanding of this function, please do not turn it into a what's XYZ's type thing.