The Cinema 4D Noise node is for using Cinema 4D's Noise shaders. Recent versions of OctaneRender® added OSL versions of the Cinema 4D noises. The Octane Noise node is a native tool and very efficient. For speed and reliability, the Octane Noise node is the better first choice, with the Cinema 4D Noise node as a fallback as needed. More details on what the C4D Noise Shader is and what it does can be found in the Cinema 4D help documentation.
Figure 1: The Cinema 4D Noise node