Public health has been described as "the technological know-how and artwork of stopping ailment", prolonging existence and enhancing excellent of existence via prepared efforts and knowledgeable alternatives of society, organizations (public and private), groups and individuals. The public may be as small as a handful of human beings or as huge as a village or a whole city. The idea of fitness takes into consideration physical, psychological, and social wellness. As such, in line with the World Health Organization, " Health is a country of entire physical, intellectual and social wellness and now no longer simply the absence of disease or infirmity".