What is thermal steady state?

(N/A) Thermal steady state is a condition in heat transfer where the temperature at every point within a body remains constant over time.
In this state,although heat continues to flow through the material,the temperature at any given point does not change because the rate of heat entering the point is exactly equal to the rate of heat leaving it.
Mathematically,this implies that $\frac{dT}{dt} = 0$ for every point in the system,where $T$ is the temperature and $t$ is time.