Interference

Interference is the term often used for the subset of noise which is not natural, but comes from other electrical systems; e.g. crosstalk, or radio and television transmissions, noise from industrial sources such a car ignitions, etc.

The terms electro-magnetic interference (EMI for short) and radio-frequency interference (RFI for short) are sometimes used, to emphasize that it is carried via the electric field and/or the magnetic field, and the wavelengths at which it appears.