What kind of building rests on a foundation?

Foundation is the underground or the substructure part of a building that transmits the load of the super structure to the ground safely.

it is the lower part of building on which the whole structure rests.

it may be made up of stone masonary, PCC or RCC.

depending the width to depth ratio it may be a shallow foundation or a deep foundation. shallow foundations are used for smaller structures and shallow foundations are used for multistoried buildings where the load carried by soil is more.