Foundation (engineering)
Foundations are designed to have an adequate load capacity depending on the type of subsoil/rock supporting the foundation by a geotechnical engineer, and the footing itself may be designed structurally by a structural engineer. The primary design concerns are settlement and bearing capacity. When considering settlement, total settlement and differential settlement is normally considered. Differential settlement is when one part of a foundation settles more than another part. This can cause problems to the structure which the foundation is supporting. Expansive clay soils can also cause problems.
Foundation (United States law)
A foundation in the United States is a type of charitable organization. However, the Internal Revenue Code distinguishes between private foundations (usually funded by an individual, family, or corporation) and public charities (community foundations and other nonprofit groups that raise money from the general public). Private foundations have more restrictions and fewer tax benefits than public charities like community foundations.