What does THD+N represent in higher order harmonic distortion?

What does THD+N represent in higher order harmonic distortion? Correct Answer Higher order distortion with noise component

THD+N represents the addition of all noise components to the fundamental frequency. Subsequently noise is also accounted for in this scale, hence it is better than the THD scale. The cause for noise being present in the amplifier output includes the power supply interference, RF interference, switching noises and many more.
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