After the footings have been poured the next step is to set in place the concrete forms. These forms are what hold the concrete until it hardens enough so that the forms can be removed. Look carefully and you will see a lot of reinforcing rod (rebar). The steel rods will remain for ever inside the concrete adding greatly to its strength. If you check in the photograph section / construction project there are many more pictures. Follow along, this will be an interesting series for you.