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A Signal is the data being transmitted from one device to another, this includes (but not limited to) binary serial data, pulse width modulation (PWM), sound. The waveform is the shape of the transmitted signal, serial data and PWM would take on a square wave waveform whereas sound from a speaker would appear (generally) as a sinewave.

Not much a of difference between the two, but that is because the two are mutually inclusive to each other.

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