A framework of heavy timbers, steel, or reinforced concrete beams laid longitudinally and crossed by similar members laid upon them to spread a heavy load over a larger area, esp. for use where the ground is not firm.
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Isolated footing Transfers individual column loads directly to the soil. If a single spread footing interferes with another spread footing, the two can be combined to form a combined footing.
Combined footing
Yes, a concrete patio step does in fact need to be on a footing. Without the proper footing foundation, the step will be uneven.
Suppose a number of columns in a row are to be supported on a soil of such low bearing strength, that separate bases if provided would overlap,a practical solution would be to provide a column footing to support all the columns of the row. such a footing is called a "STRIP FOOTING"
The footing lies on the ground around the base of the structure. The Foundation cn go way below with pilings deep into the ground.I can say that the footing is the part of foundation which transfers the load directly to the soil and foundationis the part of structure below the plinth level including the footing while footing is the part which is below the ground level.