*What I know About Holocaust*

I have heard about it but I am not sure. What I think is it about killing people of a different region or raise. I want to know if it is about killing people of a different region and raise were they lived. I am not sure if it has to do with the Jews people. I want to know if Ann Frank has to do something with the Holocaust. In what year did it happened? I also know that theres is a story about the Holocaust. I have heard that it is sad. That's all I know about the Holocaust.