Public health is the science and art of avoiding disease, extending life, and promoting well-being via organized efforts and educated decisions made by society, associations, both public and private, groups, and individuals. Preventive medicine focuses on the strength of individuals, organizations, and predefined populations. Individuals and communities benefit from public health and general preventive medicine, which focuses on promoting health and preventing disease. Practitioners combine clinical and public health expertise to assist health system transformation and establish a healthcare system centered on disease, injury, and death prevention. Public health is the study and practice of protecting and promoting a community's health, such as through preventive medicine, health education, communicable disease control, sanitary measures, and environmental hazard monitoring. The goal of public health and general preventive medicine is to improve the health of communities and defined populations by promoting health, preventing disease, and monitoring their health.