Basically, electronic noise is a bunch of sinewaves with random frequencies and amplitudes. All electronic components generate noise; even wires. Some noise is due to the random vibration of atoms due to temperature. Some noise is generated as electrons move through semiconductors. In all cases, the noise energy is distributed over a range of frequencies. Note that it's noise power that's important. A distinction is made between noise and interference. Noise is due to random physical processes while interference is man-made.
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