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The Normal Mapping channel simulates surface normals on a surface. Surface normals dictate how light is reflected off of a polygon which affects self shading. A normal map changes the reflection properties of the light bouncing off of a surface as if each pixel on the surface is a separate polygon with its own surface normal direction. Currently, DAZ Studio cannot generate normal maps but it can use them if applied to a surface.
You have the following option when working with the normal mapping channel: