Vaccination is one of the most effective public health interventions, stimulating the immune system to recognize and fight specific pathogens in individuals and communities. Vaccination strategies are tailored across the lifespan: pediatric vaccines provide foundational protection during childhood against diseases like measles and polio; adult vaccines maintain immunity and address age-specific risks such as influenza and shingles; while vaccination during pregnancy protects both mother and newborn by transferring antibodies that safeguard infants during their most vulnerable early months.