The Free Energy Principle and the Ecological Approach

The free energy principle is essentially a way of explaining systems through physics. The idea is that you have a system and the boundary of the system is called a Markov blanket. And the systems interact, but they entropy into the environment. So if it tries to look at predictability unpredictability and what was it? I can't remember the other word for it,. It looks at those sorts of things and describes the system entropy through free energy.