The Holocaust was started by Adolf Hitler, a German. Adolf Hitler somehow (always) hated Jews.
Adolf Hitler led an army called the Nazis to either kill, or escorted the Jews out of the country.
The Jews were led to contradiction camps, which they were tortured to do work, or do something for a Nazi. They were treated like slaves.
Some escaped, like Elie Wiesel. Or so far we think he escaped. (Can't find evidence that he did. Just being honest.)
Between six and five million Jews were killed.
What does the Holocaust mean in German terms? The translation is "racially superior".
Why did Hitler hate Jews? Possibly that he grew up around Jews, and they were more 'superior' to him. (AKA Wealthier) or possibly he just hated the way they looked. Not to sure.