What is noise in electronics?

In electronics, the term ‘noise’ can be defined as any unwanted disturbance in a useful electrical signal.


The amount of noise and the type of noise generated by an electronic device varies from device to device, owing to the different effects that produce noise. In a communication system, noise refers to the errors or the undesired and random disturbances that disturb a useful signal relaying some information.

  • Noise can be visualized as the summation of all disruptive energies that emanate from natural sources and certain human-made sources.
  • Despite typically being an unwanted disturbance, noise can prove useful for certain specific applications such as random number generation and dither.

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