This article discusses the role of public health in improving overall health and protecting the population from diseases. It explores the role of different agencies in identifying levels of diseases in communities, statistical data related to infectious and non-infectious diseases, and the effectiveness of approaches and strategies for controlling diseases. It also examines the use of research to determine priorities and approaches for providing services to infected people, the relationship between disease prevalence and service requirements, and the impact of current lifestyle choices on future needs for health and social care services.