Well, the innate immune system consists of many nonspecific defense mechanisms that begin to act immediately after infection takes place. And what that means is the innate immune system is the primary line of defense against these invading pathogens. That is, the innate immune system acts way before the choir immune system which usually takes several days to actually act as we'll see in the next lecture. So the innate immune system begins to act immediately and it's the primary line of defense against our pathogens. Now, another name for the innate immune system is the non specific immune system. The question is, what do we mean by nonspecific?