The Key Facts on U.S. Nonprofits and Foundations 2021 is an annual publication from Candid, combining the wisdom from Foundation Center's former Key Facts on U.S. Foundations report and GuideStar's former Nine Things You Might Not Know about U.S. Nonprofits. It offers at-a-glance information about the nonprofit sector. Where does nonprofit revenue come from? Is foundation giving growing? We answer these questions and more.