This document explores the role of public health in promoting health, preventing disease, and prolonging life in the context of health and social care. It discusses the role of different agencies such as WHO, Department of Health, and Local Authorities in identifying levels of health and disease in the population. It also explains the epidemiology of HIV and Breast Cancer in the UK using statistical data. The document further examines the effectiveness of different approaches and strategies adopted by the NHS to control these diseases. It discusses the current priorities for disease prevention and control, the relationship between disease prevalence and health service requirements, and the impact of lifestyle choices on future healthcare needs.