Which terminology deals with the excitation or stimulus applied to a system from an external source, for the generation of an output?

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The input signal is the external stimulus or excitation you apply to a system to drive it and produce a response. It acts as the driving force that leads the system to generate its output. The output signal is simply the result or response of the system after processing the input. An error signal represents the difference between a desired output and the actual output, often used in feedback control. An analogue signal describes a type of signal that varies continuously, but it doesn’t specify its role as the external drive. So, the term for the excitation applied to generate an output is the input signal.