The Material Node defines all physically relevant properties of a given surface. It is always the end point of all Nodes that pass their Results to the layers and properties of the material. This includes in particular the BSDF layers with which the shading and the reflections of the surface are defined as well as the Normals and the displacement, which can be used to additionally affect the shading and shape of a given object.

This Node combines all of a material’s information and its Result defines the object’s surface to which it is assigned.