A footing is the structural foundation element that transfers building loads to the ground, typically consisting of concrete wider than the walls or columns it supports to distribute weight over a larger soil area. Footings prevent buildings from settling unevenly or sinking. Design depends on soil conditions—poor soils require wider or deeper footings, while strong soils can support more concentrated loads. Types include strip footings (continuous under walls), spread footings (under columns), and mat foundations (single slab supporting entire buildings on weak soil). Building codes specify minimum footing requirements based on soil bearing capacity, frost depth (footings must extend below frost line to prevent heaving), and structural loads. Footing installation is inspected before concrete is poured and before backfilling covers them. Inadequate footings can cause structural problems including cracking, settling, and building failure.