Basically, i need help understanding first derivative RL circuit with zero input, So the is power in a capacitor or an inductor and this has to do with something... As time reaches infinite, i know that it'll go to zero, but what is the point?

more specifically, i have a problem of which the power source (Vs), Inductor (L) and the resistor (R) are all in series, and the voltage is taken from the two sides of the resistor (Vo) and the question asks..

"the circuit is in the ZERO STATE when the input Vs(t)=Va*u(t) V is applied. Find Vo for t>=0. Identify the forced and natural components in the output."

I feel that if i know the basic concept of the problem, and WHAT the problem is asking for, i can solve it on my own. I especially dont understand it when it saids... ZERO STATE. what does that mean?