What is Coal and Steel community in European?

I'm not sure this will answer your question, but the European Coal and Steel Community was formed after World War II. Several countries in Europe, notably France and Germany, united to rebuild after the mass destruction of the war.

This union would eventually evolve into the European Union, and the European Monetary Union (or Economic and Monetary Union; it goes by different names)

This economic and political union helped to rebuild and unite the European countries who were still suffering from recent conflicts, and would also succeed in preventing intra-continental war.