A PBR material is a set of texture maps: base colour, metallic, roughness, normal (surface detail) and sometimes ambient occlusion. Because the renderer simulates how light actually behaves, a walnut veneer or brushed brass looks right in the viewer, in AR and in a rendered lifestyle scene alike.
This is what separates photoreal product models from “rough approximations”: correct materials at the correct scale, built from real references.
Why it matters
Buyers judge finish and sheen. PBR is why a configured finish on screen matches the product that arrives.