Definition of Steady State
If the behavior of a system remains unchanged even if the time is changing continuously then such a system is said to be in a steady-state. When a system achieves such behavior then we can call this system a stable system. For the calculation of the steady-state, we can use two methods. The first method is to use time-domain algorithms and the other one is to use frequency-domain algorithms which are also known as the harmonic balance methods.
Example of Steady-State:
Let us take an example of a system to have a better understanding of the steady-state. Suppose that we have a chemical mix having some certain characteristics, you add a change-agent into it but stills its characteristics remain unchanged with the changing time.