Vaccination coverage refers to the percentage of a population that has received specific vaccines. It is an important measure for public health, as higher coverage rates can lead to herd immunity, which protects those who cannot be vaccinated, such as infants or individuals with certain medical conditions. Monitoring vaccination coverage helps health authorities identify areas with low immunization rates, allowing for targeted interventions. Vaccination programs often focus on diseases like measles, polio, and influenza, aiming to ensure that as many people as possible are protected against these potentially serious illnesses.