The World Health Organization (WHO) was established in 1948 as a specialized agency of the United Nations. Its vision is the attainment of the highest level of health for all people. WHO is responsible for providing leadership on global health matters and celebrating World Health Day annually on April 7th. It is governed by the World Health Assembly and Executive Board and divided into 6 regions and 193 member states. WHO's priorities include universal health coverage, global health security, and strengthening core public health functions.