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The Holocaust (from the Greek holókauston from olon "completely" and kauston "burnt")., also known as Ha-Shoah , Khurbn or Halokaust, is the name applied to describe the attempted genocide of Europe's Jewish population during World War II, as part of a program of ridding Europe of "undesirables" by the National Socialist regime in Germany led by Adolf Hitler.
In addition to Jews, the Nazi regime persecuted and killed other groups, including 220,000 Sinti and Roma (see Porajmos), the disabled (see Action T4), homosexuals, Jehovah's Witnesses, Soviet POWs, Polish citizens, and political prisoners.
Many scholars do not include these groups in the definition of the Holocaust, defining it solely as the genocide of the Jews, or what the Nazis called the "Final Solution of the Jewish Question". Taking into account all the victims of Nazi persecution, the death toll rises considerably; estimates generally place the total number of victims at 9 to 18 million.