And the second division is known as the specific, or the acquired immune system. So, if we look at our immune system, it could be subdivided into two categories. We have the Innate Immunity, also known as non specific Immunity, and we have the Quiet Immunity, also known as the specific Immunity. Now, what exactly is the difference between these two Immunity systems? Well, this takes in effect immediately, as soon as that pathogen actually enters our body, while our acquired Immunity takes several days to actually kick in. Now, the innate Immunity doesn't actually involve any process of learning, but the acquired Immunity requires the process of learning.