This is a method used to prevent smallpox by exposing an individual to a less virulent form of the disease. The body's immune system would then build up defenses against the more severe form.
It's like training for a big race by running smaller races first. Your body gets used to the strain and builds up endurance so that when you run the big race (encounter the actual smallpox virus), you're prepared and can fight it off effectively.
Vaccination: A process where a vaccine is administered to help develop immunity to a particular disease.
Edward Jenner: An English physician who developed vaccination for smallpox using cowpox material.
Immunization: The process by which an individual's immune system becomes fortified against an agent (known as the immunogen).
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