Public Health includes community health. Public health is "the science and art of preventing disease, prolonging life and promoting health through the organized efforts and informed choices of society, organizations, public and private, communities and individuals”. It is concerned with threats to health based on population health analysis. Public health incorporates the interdisciplinary approaches of epidemiology, biostatistics and health services, environmentak health, community health, behavioral health, health economics, public policy, insurance medicine and occupational health (respectively occupational medicine) are other important subfields. Community Health is a discipline concerned with the study and improvement of the health characteristics of different communities. Community health tends to focus on geographical areas, and includes primary, secondary and tertiary healthcare.