What is active immunity and passive immunity?

(N/A) $(1)$ Active immunity: When a host is exposed to antigens,which may be in the form of living or dead microbes or other proteins,antibodies are produced in the host body. This type of immunity is called active immunity. It is slow and takes time to give its full effective response. Injecting microbes deliberately during immunization or infectious organisms gaining access to the body during natural infection induces active immunity.
$(2)$ Passive immunity: When ready-made antibodies are directly given to protect the body against foreign antigens or agents,it is called passive immunity. The yellowish fluid colostrum secreted by the mother during the initial days of lactation has abundant antibodies $(IgA)$ to protect the infants. The fetus also receives some antibodies $(IgG)$ from the mother through the placenta during pregnancy.