One of the efforts organized by society to protect, promote and restore the people´s health. It is the combination of sciences, skills and beliefs that is directed to the maintenance and improvement of the health of all the people through collective or social actions. Note: The programmes, services and institutions involved emphasize the prevention of disease and the health needs of the population as a whole. Public health activities changing technology and social values, but the goals remain the same: to reduce the amount of disease, premature death and disease-produced discomfort and disability in the population. Public health is thus a social institution, a discipline and a practice.