Non-3D artists should note that “Physically Based Rendering” or PBR is merely a standard for defining materials. It is becoming something of an industry standard in real-time and offline rendering workflows. From a real-time(games) perspective, PBR represents a leap up in realism but from an offline(VFX) perspective, it offers no improvement in realism, and often a downgrade from past norms if implemented with no additional efforts. For someone using offline rendering, [EDIT: As per pxl_fckr’s comment, I must be short on some history of PBR. I stand corrected.]