Foundations are structural elements that transfer building loads safely to the ground. The type of foundation used depends on soil conditions, load requirements, groundwater, and site constraints.

Common foundation types include:

Raft (Mat) Foundations: Large slabs that distribute loads over a wide area.

Pad Foundations: Individual footings that support columns.

Strip Foundations: Continuous foundations supporting load-bearing walls.

Pile Foundations: Deep foundations that transfer loads to stronger soil or rock layers below the surface.

(Wikipedia)