Vaccination, also known as immunization, is a preventive healthcare measure that involves administering vaccines to stimulate the body’s immune system and build immunity against specific infectious diseases. Vaccines contain weakened or inactive forms of disease-causing pathogens or their components, which trigger an immune response without causing the actual disease. This immune response leads to the production of antibodies, memory cells, and immune protection against future infections.

Vaccination is one of the most effective public health interventions, as it helps prevent the spread of infectious diseases and reduces the risk of severe illness, complications, and death. It has played a critical role in eradicating or controlling numerous diseases, such as polio, smallpox, and measles.

Routine vaccination schedules are recommended for infants, children, adolescents, and adults, providing protection against diseases like measles, mumps, rubella, diphtheria, tetanus, pertussis, influenza, and many others.

Global vaccination efforts are essential for maintaining herd immunity, which protects vulnerable individuals who cannot be vaccinated due to medical reasons. Public health campaigns and continuous research and development of vaccines play a pivotal role in safeguarding global health and preventing the resurgence of vaccine-preventable diseases.