A concentration camp was a location where people, usually civilians, were imprisoned.
Nazi Germany operated many concentration camps during the 1930s and '40s, where millions of people were killed.
In 2370, Quark told Benjamin Sisko that the Ferengi had nothing as barbaric as them. (DS9: "The Jem'Hadar")
- In the original script, Quark mentioned the Auschwitz concentration camp.