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The mapping type defines how the shader chooses what pixel of the layer is visible at what parts of the object.

UV Map/Map2 Uses the first or second UV map of the object.	Reflection The reflection of the surface normal and the view direction (Use with cubemaps for good reflections).
Direction The surface normal, can be used with cubemaps for IBL.	Rim Light Rim Light, the left side of the input appears on the edges of objects, while the right side is in the middle. A good use is with a gradient for rim lighting.
Generate Generate the map with tri-planar mapping, good for procedurally generated objects without UV Maps.	View The position on the screen.
Position The world position of the pixel.