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A SPICE switch is a circuit element that can open or close a circuit based on certain conditions, simulating the behavior of physical switches in electronic circuits. It is often used to model the on/off states of components, such as relays, transistors, or mechanical switches. In SPICE simulations, switches can be controlled by voltage or current levels, allowing them to change states dynamically in response to circuit conditions. This functionality makes SPICE switches essential for analyzing circuit performance under different operational scenarios and for implementing control logic in simulations.