Is there such a thing as band-limited non-linear distortion?

1. How do you reduce non-linear distortion?
2. Is distortion non-linear?
3. Why non-linear distortion is called harmonic distortion?

How do you reduce non-linear distortion?

Nonlinear distortion produced in a given circuit can be reduced by pre- or postdistorting the signal applied to or from the circuit.

Is distortion non-linear?

A linear distortion is defined as a change in amplitude or phase with no new frequencies added. A non-linear distortion occurs when new frequency components are generated. Non-linear distortions are what is usually meant by "distortion".

Why non-linear distortion is called harmonic distortion?

With non-linear distortion the application of a sinusoidal input voltage results in a periodic output waveform that is non-sinusoidal. Fourier analysis shows that spurious harmonics are present, the result being known as harmonic distortion.