Answer: a distinction is made between shallow foundations and deep foundations.
The foundation is the lower part of a construction, which allows its weight to be distributed on the ground evenly, without causing different settlements from one point to another on the surface, and thus avoiding significant damage. The choice of building foundation techniques is therefore essential, especially when the ground is not stable. There are two main foundation techniques: shallow foundations and deep foundations. The choice depends on the nature of the soil on which your house will rest. The superficial foundations are to be carried out on stable grounds, or for light constructions, not requiring additional reinforcements. To make deep foundations, or so-called "stilts" foundations when the stable ground is several meters from the surface, piles, diaphragm walls or any other technique making it possible to reach this stable ground will be used.