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Public health is an essential, multi-disciplinary field that offers many exciting career possibilities. Public health refers to the overall health of a group of people. This could refer to a town, a state or even a nation. Public health professionals work to ensure that communities are as healthy as possible. Degree programs in this field are available at the bachelor's and the master's degree levels. You can take public health courses from online or brick-and-mortar schools. Training in public health usually includes schoolwork in topics like chemistry, statistics, epidemiology, disease prevention, and environmental health. Some people with public health degrees choose to use their training to run organizations that maintain the health of a population, such as hospitals and senior care centers.