A private foundation is a tax-exempt organization that does not rely on broad public support and generally claims to serve humanitarian purposes.

A foundation is a type of nonprofit organization or charitable trust that usually provides funding and support to other charitable organizations through grants, while also potentially participating directly in charitable activities. Foundations encompass public charitable foundations, like community foundations, and private foundations, which are often endowed by an individual or family. Nevertheless, the term "foundation" might also be adopted by organizations not primarily engaged in public grantmaking.