The impact of world vaccines on global health is very significant, with an important role in reducing mortality and morbidity due to infectious diseases. Vaccines work by stimulating the body’s immune system to recognize and fight infections, thereby protecting individuals and society as a whole. One of the biggest impacts of vaccination is achieving herd immunity. When a high enough proportion of the population is vaccinated, the spread of the virus can be slowed or stopped. For example, vaccination against measles, polio, and diphtheria has reduced the incidence of these diseases globally. WHO reports that between 2000 and 2020, vaccination saved 37 million children’s lives in a 20-year period. The impact of vaccines can also be seen in handling pandemics, such as COVID-19. Rapidly developed COVID-19 vaccines have proven effective in reducing infection rates, hospitalizations and deaths. In contrast to previous pandemics, mass vaccination is a priority to control the spread of the virus and restore economic activity around the world. Additionally, vaccines impact global health through reducing the burden of disease. A comprehensive and affordable immunization program can reduce national health expenditure and reduce the grip of poverty. Countries with strong vaccination programs tend to have more economic productivity and better quality of life. However, challenges remain, including unequal access to vaccines. Low-income countries often find it difficult to obtain sufficient vaccine supplies. Initiatives such as COVAX are trying to bridge this gap by distributing vaccines globally, but many regions are still experiencing shortages. The issue of vaccine safety is also a concern. Although side effects are generally mild and rare, false information can lead to vaccine hesitancy. Effective public education is needed to overcome skepticism and ensure high levels of public participation. There are also potential long-term positive impacts of vaccination. Innovations in vaccine technology, such as mRNA, could contribute to the development of vaccines for other diseases, including cancer and autoimmune diseases. Further research in this area may open new opportunities for disease prevention in the future. Therefore, support for vaccine research and development, as well as broad vaccination campaigns, is key to achieving better global health. Vaccines have the ability to protect individuals and improve the welfare of society as a whole. Success in vaccination is not only a scientific achievement, but also an important step towards global health justice.