Funding is essential for WHO to implement programmes and improve health throughout the Region. Donors provide an indispensable source of funding which contributes to financing WHO programme budget priorities. Our donors come from diverse backgrounds – Member States, international organizations, the private sector, and other sources. Funds go to WHO headquarters, regions, or specific programme areas. Programme funding consists of ongoing base programmes and event-driven non-base programmes (i.e., polio, outbreaks, crisis response). Base funding is comprised of specified voluntary contributions, assessed contributions, programme support costs, and voluntary contributions. Member states are the largest source of voluntary contributions.