The World Health Organisation (WHO) is a specialized agency of the United Nations that is concerned with international public health. It was established on April 7th 1948, with the primary objective of providing leadership to the global health agenda, and setting standards for health care systems around the world. WHO works in collaboration with its member states and other partners to ensure the highest attainable level of health for all people. WHO's core functions are to provide leadership on matters critical to health, develop evidence-based policy options, provide technical support to countries, and monitor health trends. It works to ensure the quality and safety of medicines, vaccines, and other health products, and provides information and advice on disease prevention and health promotion. WHO also works to promote research and innovation, to foster health systems strengthening, and to promote health in all policies. It supports countries in the development of sound health policies and systems, and in the implementation of internationally agreed health goals.