This book traces the progress of the field of public health and highlights some of its key concepts and applications. As a branch of science public health deals with protecting and improving the health of people by promoting better lifestyle choices, diagnosis and prevention of infectious diseases and advocating general hygiene. It has various sub-fields like community health, health economics, insurance medicine, environmental health, etc. This book elucidates the theories and innovative models around prospective developments with respect to this subject. It attempts to understand the multiple branches that fall under this discipline and how such concepts have practical applications. Most of the topics introduced in this book cover the immediate concerns and emerging strategies of public health. This text will provide comprehensive knowledge to the readers and will serve as a valuable reference guide.