1) The Holocaust was the systematic persecution and murder of approximately 11 million people by the Nazi regime and its allies. Over half of the victims were Jews.
2) Beginning in 1933, the Nazis passed laws stripping Jews of their rights and persecuting them. This escalated throughout the 1930s with violence and ghettos.
3) In 1941-1945, the Nazis and their collaborators murdered around 6 million Jews across German-occupied Europe in concentration camps using poison gas and other methods in Hitler's "Final Solution."