Public health nurses make up the largest professional part of the public health workforce, and they are active in public health prevention, education, advocacy, activism, assessment, and evaluation. They play a key role in prevention of disease as well as community health and safety. Every day, nurses have a direct impact on the health and well-being of patients. Nurses are ideally positioned to advocate lifestyle changes in communities and provide instruction on healthy living – notably to the most vulnerable members of society. Public health nurses work in communities, focusing on various areas in order to improve the overall health of the people who live there. School districts, county or state health agencies, and correctional facilities are among places where public health nurses can work.