Public health is the science and practice of protecting and improving the health of populations through health promotion, disease prevention and epidemiological surveillance. It takes a collective approach, based on scientific evidence, to address the social, environmental and behavioral determinants of health. It coordinates policies, programs and provides guidance to reduce health inequalities and improve quality of life. It covers areas including food safety, vaccination, occupational health and health planning. The goal is to achieve the highest possible level of health for the community as a whole, rather than focusing solely on individuals.