The World Health Organization (WHO) is a specialized agency of the United Nations that works to promote global public health. It was established in 1948 and is headquartered in Geneva, Switzerland. WHO currently has 194 member states and works to attain a level of health that allows people to lead productive lives. It is organized into the World Health Assembly, Executive Board, and Secretariat. The World Health Assembly acts as the legislative and supreme body that sets policies, while the Executive Board implements decisions and the Secretariat carries out WHO's work.