Now, in this process, we gain memory cells. If we examine the natural process, we have to get the actual infection from that pathogen. We have to be infected by that pathogen to gain the same exact response to basically form those same memory cells that contain the antibody. So both of these two are two methods of gaining active immunity. One is via an artificial so immunization via a vaccine and the other one is a natural via the process of infection. Now, what about the temporary process of passive immunity which basically injects in one way or form antibodies into our body and those antibodies can bind onto the pathogenic antigens, labeling them for destruction.