Vaccination is a medical process that involves administering a vaccine to stimulate the body's immune response against specific diseases. Vaccines contain weakened or inactive parts of a particular organism, such as a virus or bacterium, which helps the immune system recognize and fight off the actual disease in the future. This process is crucial in preventing outbreaks and protecting public health. Vaccination has played a significant role in reducing the incidence of infectious diseases like Polio, Measles, and Influenza. By achieving high vaccination rates within communities, herd immunity can be established, which protects those who cannot be vaccinated due to medical reasons. This collective effort is vital for maintaining a healthy population and preventing the resurgence of previously controlled diseases.