Steady state error is the value of the error signal or the offset in the process variable after the control system has responded to a change and settled down to its final value.

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Quizplus · Accepted Answer

Steady state error is indeed the difference between the desired and actual output values of a system after it has reached equilibrium following a disturbance or input change, indicating how accurately the system maintains its target state.

Steady State Error Is the Value of the Error Signal