Footings are the lowest parts of the buildings. Usually, these ground levels are divided into three groups: isolated/pad footing, strip footing, and raft/mat footing. Firstly, isolated/pad footing is a part which supports columns. These can be square, circular or rectangular. Secondly, the strip footing represents a strip of concrete which carries the load. Thirdly, raft/mat footing is a continuous footing that supports the whole structure. Also, these are called foundation mats. However, the engineers and architects know that is best for every construction.
Footings Details and Descriptions
See the pictures below, and afterwards click the link underneath for more detailed descriptions for the similarities and differences.