Yeah, this is a very basic question that the emerging engineers must be able to understand. We are often not sure about the output waveform we see in oscilloscope whether it is distorted or is it a noise. But both are different even though they are unwanted.
What is NOISE?
Noise means any unwanted signal. They are unpredictable.
What is DISTORTION?
A distortion is the alteration of the original shape (or other characteristic) of the given signal. (or)
The behavior of an electrical device or communications system whose output is not identical in form to the input signal.
You can get all the definitions from the site Answers.com
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