The Holocaust was the genocide of Jewish people living throughout Europe. When the Nazis occupied Poland, all of the Jewish men, woman and children were forced to the an area designated for them, the Warsaw Ghetto.
Irena Sendler was a nurse in Poland during the Holocaust. She saw the horrors first hand and vowed to save the children from the Warsaw Ghetto. She went on to save 2500 children from famine and death. She was nominated for the Nobel Peace Prize shortly before her death.