What is a RPG?

[Mirage]

But I guess this kinda brings me to my point, we are still able to distinguish an RPG from other titles but what characteristics does an modern RPG hold that we are able to identity and then distinguish? Is it simply a void? We know its not an RPG cause it isn't like an action game or its obviously not an FPS? Or does it actually have characteristics that make it unique from other genres?

In a JRPG it's these things that let people identify them as a "JRPG".
Exp system where defeating x amount of enemies increases various statistics.
Usually turn-based or pseudo-turn-based (such as ATB) combat.

In a WRPG it's usually these things:
Exp system where defeating x amount of enemies increases various statistics.
Skills that have a use outside of battle.
Multiple choice on how to solve many problems.
Usually realtime action-based combat, with some mods.