Vaccines are substances used to stimulate the production of antibodies and provide immunity against one or several diseases.
Consider vaccines as training sessions for your immune system's soldiers. They introduce a harmless version of the enemy so your soldiers can learn how to fight it off, preparing them for a real battle.
Immunity: The ability of an organism to resist a particular infection or toxin by the action of specific antibodies or sensitized white blood cells.
Herd Immunity: A form of indirect protection from infectious disease that occurs when a large percentage of a population has become immune to an infection, thereby providing a measure of protection for individuals who are not immune.
Inoculation: The introduction of an antigenic substance or vaccine into the body to produce immunity to a specific disease.
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