A foundation supports the weight of the building that is placed on top of it. The foundation spreads the load of the building to the ground below and supports the building evenly. Inadequate foundations mean that the building is at high risk for plaster cracking, or the structure eventually collapsing.
Shallow or deep, foundations can be made from wood, steel or concrete, in various different styles
Support in strips underneath the walls.
A solid continuous base under the whole building.
Pillars or piles (commonly known as stumps) are sunk deeply into the ground and the building is supported by spreading the wight over the pillars.
Slabs have footings for extra support and a solid concrete slab.
How do you know if your home needs restumping?
Build.com.au also have this interesting article on restumping that might be of interest: http://www.build.com.au/restumping-house