The word “Holocaust,” from the Greek words “holos” (whole) and “kaustos” (burned), was historically used to describe a sacrificial offering burned on an altar. Since 1945, the word has taken on a new and horrible meaning: the mass murder of some 6 million European Jews (as well as millions of others, including Gypsies and homosexuals) by the German Nazi regime during the Second World War. To the anti-Semitic Nazi leader Adolf Hitler, Jews were an inferior race, an alien threat to German racial purity and community. After years of Nazi rule in Germany, during which Jews were consistently persecuted, Hitler’s “final solution”–now known as the Holocaust–came to fruition under the cover of world war, with mass killing centers constructed in the concentration camps of occupied Poland.

With the appointment in January 1933 of Adolf Hitler as Chancellor of Germany, and the establishment of the Third Reich, German leaders proclaimed the rebirth of the Volksgemeinschaft ("people's community").[75] Nazi policies divided the population into two groups: the Volksgenossen ("national comrades") who belonged to the Volksgemeinschaft, and the Gemeinschaftsfremde ("community aliens") who did not. Enemies were divided into three groups: the "racial" or "blood" enemies, such as the Jews and Roma; political opponents of Nazism, such as Marxists, liberals, Christians, and the "reactionaries" viewed as wayward "national comrades"; and moral opponents, such as gay men, the work shy, and habitual criminals. The latter two groups were to be sent to concentration camps for "re-education", with the aim of eventual absorption into the Volksgemeinschaft. "Racial" enemies could never belong to the Volksgemeinschaft; they were to be removed from society.[76]

Recognising that battlefield conditions changed rapidly and that orders often became overtaken by events, the German army encouraged its commanders to make decisions without waiting for orders from above, thus allowing them to take advantage of fleeting opportunities as they arose. Above all else, this doctrine created aggressive and flexible leaders.

As the war progressed, Allied armies began using combined arms formations and deep penetration strategies that Germany had attempted to use in the opening years of the war. Many Allied operations in the Western Desert and on the Eastern Front relied on massive concentrations of firepower to establish breakthroughs by fast-moving armoured units. These artillery-based tactics were also decisive in Western Front operations after Operation Overlord and both the British Commonwealth and American armies developed flexible and powerful systems for utilizing artillery support. What the Soviets lacked in flexibility, they made up for in number of multiple rocket launchers, cannon and mortar tubes. The Germans never achieved the kind of response times or fire concentrations their enemies were capable of by 1944.

Remarkably, there were instances of individual resistance and collective efforts at fighting back inside Auschwitz. Poles, Communists and other national groups established networks in the main camp. Some Jews assaulted Nazi guards, even at the entrance to the gas chambers. In October 1944, the Sonderkommando crew at crematoria IV revolted and destroyed the crematoria. It was never used again.

The St. Louis arrived in Havana harbor on May 27th. Of the 937 passengers on board, only 28 passengers were allowed into Cuba. 22 of these passengers were Jewish and had valid U.S. visas, 4 were Spanish citizens and 2 were Cuban nationals, all with valid documents. This story gained a lot of publicity; it was spread throughout Europe and the United States. The U.S. newspapers reported the story compassionately, but only a handful suggested that the refugees should come to the United States. The United States government decided not to take the steps to permit the passengers into the country.
Oskar Schindler, (born April 28, 1908, Svitavy [Zwittau], Moravia, Austria-Hungary [now in the Czech Republic]—died October 9, 1974, Hildesheim, West Germany), German industrialist who, aided by his wife and staff, sheltered approximately 1,100 Jews from the Nazis by employing them in his factories, which supplied the German army during World War II.
In addition to this camp, which has been fairly well-documented, the Nazis also briefly maintained a Gypsy (Roma and Sinti) camp.  Although both prisoners and Nazis commented upon the musical skill and creativity of these inmates, little documentation exists of their musical production.  This is also partially due to their isolation from other inmates, and their extremely harsh treatment by the SS, second only to what was meted out to the Jews in cruelty.  Nonetheless, there are several references to an orchestra, as well as to less formal musical groups.
Allied air superiority became a significant hindrance to German operations during the later years of the war. Early German successes enjoyed air superiority with unencumbered movement of ground forces, close air support, and aerial reconnaissance. However, the Western Allies' air-to-ground aircraft were so greatly feared out of proportion to their actual tactical success, that following the lead up to Operation Overlord German vehicle crews showed reluctance to move en masse during daylight. Indeed, the final German blitzkrieg operation in the west, Operation Wacht am Rhein, was planned to take place during poor weather which grounded Allied aircraft. Under these conditions, it was difficult for German commanders to employ the "armoured idea" to its envisioned potential.

In chambers II and III, the killings took place in underground rooms, and the corpses were carried to the five ovens by an electrically operated lift. Before cremation gold teeth and any other valuables, such as rings, were removed from the corpses. In IV and V the gas chambers and ovens were on the same level, but the ovens were so poorly built and the usage was so great that they repeatedly malfunctioned and had to be abandoned. The corpses were finally burned outside, in the open, as in 1943. Jewish Sonderkommandos worked the crematoria under SS supervision.

One of the most remarkable humanitarian acts performed by Oskar and Emilie Schindler involved the case of 120 Jewish male prisoners from Goleszow, a sub-camp of Auschwitz. The men had been working there in a quarry plant that belonged to the SS-operated company “German Earth and Stone Works.”  With the approach of the Russian front in January 1945, they were evacuated from Goleszow and transported westward in sealed cattle-wagons, without food or water. At the end of a seven-day grueling journey in the dead of winter, the SS guards finally stationed the two sealed cattle-cars with their human cargo at the gates of Brunnlitz. Emilie Schindler was just in time to stop the SS camp commandant from sending the train back. Schindler, who had rushed back to the camp from some food-procuring errand outside, barely managed to convince the commandant that he desperately needed the people who were locked in the train for work.

While the Nazis murdered other national and ethnic groups, such as a number of Soviet prisoners of war, Polish intellectuals, and gypsies, only the Jews were marked for systematic and total annihilation. Jews were singled out for "Special Treatment" (Sonderbehandlung), which meant that Jewish men, women and children were to be methodically killed with poisonous gas. In the exacting records kept at the Auschwitz death camp, the cause of death of Jews who had been gassed was indicated by "SB," the first letters of the two words that form the German term for "Special Treatment."
At Auschwitz alone, more than 2 million people were murdered in a process resembling a large-scale industrial operation. A large population of Jewish and non-Jewish inmates worked in the labor camp there; though only Jews were gassed, thousands of others died of starvation or disease. During the summer of 1944, even as the events of D-Day (June 6, 1944) and a Soviet offensive the same month spelled the beginning of the end for Germany in the war, a large proportion of Hungary’s Jewish population was deported to Auschwitz, and as many as 12,000 Jews were killed every day.
In the aftermath of the Holocaust, many of the survivors found shelter in displaced persons  camps administered by the Allied powers. Between 1948 and 1951, almost 700,000 Jews emigrated to Israel, including 136,000 Jewish displaced persons from Europe. Other Jewish displaced persons emigrated to the United States and other nations. The last camp for Jewish displaced persons closed in 1957.
The biblical term shoah (Hebrew: שׁוֹאָה), meaning "destruction", became the standard Hebrew term for the murder of the European Jews, first used in a pamphlet in 1940, Sho'at Yehudei Polin ("Sho'ah of Polish Jews"), published by the United Aid Committee for the Jews in Poland.[11] On 3 October 1941 the cover of the magazine The American Hebrew used the phrase "before the Holocaust", apparently to refer to the situation in France,[12] and in May 1943 The New York Times, discussing the Bermuda Conference, referred to the "hundreds of thousands of European Jews still surviving the Nazi Holocaust".[13] In 1968 the Library of Congress created a new category, "Holocaust, Jewish (1939–1945)".[14] The term was popularized in the United States by the NBC mini-series Holocaust (1978), about a fictional family of German Jews,[15] and in November 1978 the President's Commission on the Holocaust was established.[16] As non-Jewish groups began to include themselves as Holocaust victims too, many Jews chose to use the terms Shoah or Churban instead.[12][g] The Nazis used the phrase "Final Solution to the Jewish Question" (German: die Endlösung der Judenfrage).[18]
By 1943 it was evident to the armed forces leadership that Germany was losing the war.[358] The mass murder continued nevertheless, reaching a "frenetic" pace in 1944.[359] Auschwitz was gassing up to 6,000 Jews a day by spring that year.[360] On 19 March 1944, Hitler ordered the military occupation of Hungary and dispatched Eichmann to Budapest to supervise the deportation of the country's Jews.[361] From 22 March, Jews were required to wear the yellow star; forbidden from owning cars, bicycles, radios or telephones; then forced into ghettos.[362] From 15 May to 9 July, 440,000 Jews were deported from Hungary to Auschwitz-Birkenau, almost all to the gas chambers.[v] A month before the deportations began, Eichmann offered to exchange one million Jews for 10,000 trucks and other goods from the Allies, the so-called "blood for goods" proposal.[365] The Times called it "a new level of fantasy and self-deception".[366]
Thus although the Nazi 'Final Solution' was one genocide among many, it had features that made it stand out from all the rest as well. Unlike all the others it was bounded neither by space nor by time. It was launched not against a local or regional obstacle, but at a world-enemy seen as operating on a global scale. It was bound to an even larger plan of racial reordering and reconstruction involving further genocidal killing on an almost unimaginable scale, aimed, however, at clearing the way in a particular region – Eastern Europe – for a further struggle against the Jews and those the Nazis regarded as their puppets. It was set in motion by ideologues who saw world history in racial terms. It was, in part, carried out by industrial methods. These things all make it unique.
In fall 1941, the Nazis began transporting Jews out of the ghetto. Most of them were sent to the Bełżec extermination camp and killed.[45] On 13 March 1943, the ghetto was liquidated and those still fit for work were sent to the new concentration camp at Płaszów.[46] Several thousand not deemed fit for work were sent to extermination camps and killed. Hundreds more were killed on the streets by the Nazis as they cleared out the ghetto. Schindler, aware of the plans because of his Wehrmacht contacts, had his workers stay at the factory overnight to prevent them coming to harm.[47] Schindler witnessed the liquidation of the ghetto and was appalled. From that point forward, says Schindlerjude Sol Urbach, Schindler "changed his mind about the Nazis. He decided to get out and to save as many Jews as he could."[48]