Active Immunity:
Active immunity is immunity that develops as a result of natural or deliberate exposure to an antigen. A vaccination is an example of active immunity. Vaccinations stimulate the immune system with an antigen. The immune system then produces B and T cells that quicken and strengthen the body's response to repeated infection. This is an example of passive immunity because it artificially exposes the immune system to weak or dead pathogens for a sickness or a disease. In response to this, the immune system uses antibodies to kill and build up an immunity to the disease or sickness injected into the body through a vaccination. Also, the body makes memory cells to remember how to fight the pathogens of this kind if they ever come up again.
Passive Immunity:
Passive immunity is temporary immunity that also develops as a result of natural or deliberate exposure to an antibody. Temporary immunity isn't permanent, which means the next time the pathogens enter the body, the body will get sick again, because it hasn't built up a full immunity to the pathogens. It is the result of the introduction of externally produced antibodies into a person's blood. Antibodies produced against a pathogen by other organisms can be used to produce temporary immunity. This type of immunity is short acting, and is typically seen in cases where a patient needs immediate protection from something he or she cannot form antibodies quickly enough independently for. Artificial passive immunity involves the introduction of antibodies through means such as injection. For example, in the treatment of some diseases, patients may be given a serum obtained from patients who have recovered to help them fight the disease.