Around 5.7 million.
The Jews.
a ghetto during world war 2 was a place where the Jews were sent. they were sometimes sealed off. many died in ghettos because of starvation or illness.
100,000
Not many were captured in the ghettos, as the Germans did not venture in very much and when they wanted any of the Jews from the ghetto, they just asked for them.
Sadly, many Jews who died during the Holocaust were buried in mass graves or incinerated in large furnaces.
a lot. People are unlikely to answer this question as Germany and other countries have not yet revealed how many have died in Germany so you, nor any other person who wants to find this out, will be able to find out how many Jews have died at the Nazi Germany time.
In total, there were over 540 Jewish ghettos in the entire Nazi empire, which sent the majority of the Jews to their deaths. Over 2 million Polish Jews died in the death camps, which operated in conjunction with certain ghettos. Most ghettos were 'closed' (sealed off with high walls and barbed wire) as in the case of Lodz, Czestochowa, Warsaw, Krakow while others remained 'open' as in Sosnowiec, until the actual deportation of Jews occurred.
Although there isn't a total count of all the ghettos in Nazi occupied territories. In German occupied Poland and Soviet Union alone, there were over 1,000 ghettos. The largest of all the ghettos was the Warsaw ghetto in Poland. It contained over 400,000 Jews within a mere 1.3 square miles.
They were evicted from their dwellings and told that they had housing in the ghettos. By 1941 any Jew not in a ghetto (or camp) in German controlled territory would most likely have been shot. (as that was easier than arranging transport to a ghetto, or camp)
Mostly by threat of punishment if they were found not to be in the ghettos (the punishment was generally capital). In many the main exit and entry points also had guards.
Some died because they became very sick and many got shot and killed by the SS officers. They also committed suicide. Jews also could not afford food in the ghettos and suffered from starvation.
Soon after invading Poland in 1939 the Nazis established ghettos - that is, walled-off designated Jewish area - in the larger Polish cities. The largest ghettos in Poland were those in Warsaw, Lublin, Lodz and Krakow. Jews from other parts of these cities and also from surrounding areas were transported to these ghettos, which became desperately overcrowded. The Jews were cut off from the outside world and were completely dependent on the Nazis for food. Many Jews died of malnutrition and disease in the ghettos. Later the surviving Jews were taken to death camps and gassed.