The Holocaust: German forces liquidate the Jewish ghetto in Kraków.

The Holocaust, known in Hebrew as the Shoah, was the genocide of European Jews during World War II. From 1941 to 1945, Nazi Germany and its collaborators systematically murdered some six million Jews across German-occupied Europe, around two-thirds of Europe's Jewish population. The murders were committed primarily through mass shootings across Eastern Europe and poison gas chambers in extermination camps, chiefly Auschwitz-Birkenau, Treblinka, Belzec, Sobibor, and Chełmno in occupied Poland. Separate Nazi persecutions killed millions of other non-Jewish civilians and prisoners of war (POWs); the term Holocaust is sometimes used to include the murder and persecution of non-Jewish groups.

Nazi Germany, officially the German Reich and later the Greater German Reich, was the German state between 1933 and 1945, when Adolf Hitler and the Nazi Party controlled the country, transforming it into a totalitarian dictatorship. The Third Reich, meaning "Third Realm" or "Third Empire", referred to the Nazi claim that Nazi Germany was the successor to the earlier Holy Roman Empire (800–1806) and German Empire (1871–1918). The Third Reich, which the Nazis referred to as the Thousand-Year Reich, ended in May 1945, after 12 years, when the Allies defeated Germany and entered the capital, Berlin, ending World War II in Europe.

The Kraków Ghetto was one of five major metropolitan Nazi ghettos created by Germany in the new General Government territory during the German occupation of Poland in World War II. It was established for the purpose of exploitation, terror, and persecution of local Polish Jews. The ghetto was later used as a staging area for separating the "able workers" from those to be deported to extermination camps in Operation Reinhard. The ghetto was liquidated between June 1942 and March 1943, with most of its inhabitants deported to the Belzec extermination camp as well as to Płaszów slave-labor camp, and Auschwitz concentration camp, 60 kilometres (37 mi) rail distance.