What was the Holocaust?

In the 42,500 concentration camps and incarceration sites estimated by the Holocaust Museum, there were 30,000 slave labor camps, 1,150 Jewish ghetto and 980 concentration camps. The Nazis set up about 1,000 prisoners of war camps and had 500 brothels with dedicated sex slaves. There were also thousands of other camps used to euthanize the sick and elderly.

https://www.nbcnews.com/storyline/smart-facts/what-was-holocaust-n956741