AIM-Spice is the most commonly used analog circuit simulator today and is enormously important for the electronics industry.
SPICE is a general purpose analog simulator which contains models for most circuit elements and can handle complex nonlinear circuits.
The simulator can calculate dc operating points, perform transient analyses, locate poles and zeros for different kinds of transfer functions, find the small signal frequency response, small signal transfer functions, small signal sensitivities, and perform Fourier, noise, and distortion analyses.
It is simply a graphical representation of what a resistor does in a circuit.
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