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Noise is sound that is not wanted by the perceiver, because it is unpleasant, loud, or interferes with hearing. This results in the subjective discretion between sound and noise, where any sound may be considered noise depending on the perceiver. From a physics standpoint, noise is indistinguishable from sound as both are vibrations through a medium, like air or water. The difference arises from how the brain receives and perceives a sound. By extension, in experimental sciences, "noise" refers to any random fluctuations of data that makes more difficult the perception of an expected signal.