Visual noise in photography heavily dependant upon ISO section. Noise may appear in digital images. It is one type of graininess, leading to lousy picture. Thus, manipulating , the exact pre-conceived ideas of the image. Noise depends upon the camera hardware sensor, it also depends upon camera pixels , lighting environment. So, in one sentence it may conclude that visual noise which is actually unwanted, depends upon many factor like camera algorithm, sensors also on lighting environment.
High ISO setting drive the processor to strengthen the weak signal and thus more grainier and more noisier and vice-versa. At more higher ISO setting photograph, you may take really small print outs to have good low noise printouts. So, in order to get less noise in photograph you may have to use low ISO setting, if you are exceptionally talented professional photographer, then you may depend on your ability to alter the default trend.
See the screenshot bellow and spot the difference : (1)- original photo with noise, (2)- original photo with medium noise, (3)- original photo with no noise.