What is the purpose of a vaccination?

The purpose of a vaccination is to stimulate the immune system to develop immunity against specific pathogens. Vaccinations introduce antigens—substances that evoke an immune response—into the body, allowing the immune system to recognize and remember these pathogens without causing the disease itself. When the vaccinated individual is later exposed to the actual pathogen, their immune system can respond more rapidly and effectively, reducing the likelihood of illness or its severity.

Vaccinations are a proactive measure aimed at preventing diseases rather than treating them after they occur. They do not serve to cure infections—this would involve active treatment of an already established infection. Similarly, vaccinations are not designed for diagnosing diseases or providing immediate relief from symptoms; rather, they are a long-term strategy for building immunity and preventing future infections.