Basically a state that is believed to be a "good state", and anything outside of that state is a "bad state". Its like changing the air filter on a car when it'

Basically a state that is believed to be a "good state", and anything outside of that state is a "bad state". Its like changing the air filter on a car when it's not running right, but it just happened to need an air filter but the real problem is the fuel injector and the rubber hoses deteriorating.