It varied from one ghetto to another. Usually, the Nazis did not like the people in ghettos to have money that was valid outside the ghetto, as they regarded money as a potential source of power. The best known "ghetto money" was that produced by the Lodz ghetto and by Terezin (Theresienstadt). On entering the Lodz Ghetto, Jews had to swap their ordinary currency for ghetto currency, that could not be used outside the ghetto.
Hitler
there were no Jewish ghettos in Germany during the Holocaust.
The Jews and Gypsies within the ghetto were the most affected.
Over 150,000 people died in the Ghetto.
in Łódź
The typical ghetto during the Holocaust had multiple families living in an apartment with broken plumbing. People were starving and there was human waste in the streets.
bomb as in typing is the bomb
There were many, many ghettos during the Holocaust. Which are you referring to?
Minsk Budapest Krakau
usually the currency of the country that the ghetto was in.
There were approximately 5,000-6,000 children who lived in the Lodz Ghetto during the Holocaust. Tragically, the majority of them did not survive. It is estimated that only around 900 children from the ghetto survived until the end of the war.
Poland, Belarus and Lithuania.