Public health is defined as the science and art of preventing disease and prolonging life through organised community efforts. Public health aims to improve the quality of life through prevention of disease. Public health is done through the surveillance of cases and environment. Many of the diseases are preventable through simple methods. Public health is to prevent and manage diseases, injuries and other health conditions. Public health is different for every person. Public health professionals try to prevent problems. Public health train to improve the quality of life in preventing and treating disease include mental health. It activities aim to provide condition in which people can be healthy and focus on entire populations. Thus, the public health is concerned with the total system. There is a protection on part of the public government or public health authorities that the condition is a public health problem. It covers three key areas. Health protection: Protection against environmental threats infectious diseases. Health improvement: Target individual or protect health by education and legislation. Health-care services: Provide, analyse and optimise health-care services. Epidemiology used in public health. It is a science analysing the incidence, distribution and control of disease as well as factors promoting health.
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