Non-Governmental Organisations (NGOs) play an important role in public health by supplementing the efforts of government agencies and reaching communities that are often inadequately served by formal health systems. They are voluntary, non-profit organisations that work independently or in collaboration with governments, international agencies and local communities to address social and health-related problems. One of the major roles of NGOs is to provide health services to vulnerable and underserved populations. NGOs often establish health centres, mobile clinics and outreach programmes in rural, remote and urban poor communities where access to hospitals and qualified health professionals is limited. They provide services such as maternal and child health care, immunisation, nutrition support, family planning, treatment of common illnesses and health counselling. NGOs also contribute significantly to disease prevention and control. They conduct programmes related to tuberculosis, HIV/AIDS, malaria, leprosy and other communicable diseases. Their activities include awareness campaigns, screening, early detection, treatment support, contact tracing and follow-up. In