A new scheme is being introduced in the UK where children of Holocaust survivors go into schools to talk about their parents' experiences.
It's because as Holocaust survivors get older it becomes harder and harder for them to visit schools to explain the atrocities they went through to kids.
Six million Jews and millions of other people were killed during World War Two in what is called the Holocaust.
Other groups targeted by the Nazis included homosexuals and the disabled.
The killings took place in Europe between 1933 and 1945 and were organised by the German Nazi party, which was led by Adolf Hitler.