@araly thank you! :) PBR is for physically based rendering, a technique with which you texture objects. In my case, I do it by sculpting a highpoly and baking those details on a lowpoly. The maps that come out of it help with making the final textures. The details can be displayed by the normal map and the other texture maps on a more lowpoly model. Another way to texture an object would be handpainting for example!