What is the importance of Iron and steel industries? I want the answer on this qs. urgently.....!!!!!

Iron and Steel industry forms the backbone of the economy. Iron and steel helps to manufacture machines that support other producing units.The level of per capita consumption of steel is treated as one of the important indicators of socio-economic development and living standard of the people in any country.  It is  a product of a large and technologically complex industry having strong forward and backward linkages in terms of material flow and income generation.