Italian is a Romance language spoken by ~60 million people, primarily in Italy. It belongs to the same family as Spanish, French, Portuguese, Romanian, and Catalan.
European refers to anything originating from the continent of Europe—geographically bounded by the Arctic, Atlantic, Mediterranean, Black Sea, and Ural Mountains. Europe comprises over 40 countries with diverse languages, cultures, and histories.
Italian is one of many European languages; equating the two is like confusing "French" with "European."