Just to clarify:
Concentration Camps (in German: Konzentrationslager, KZ) were rison camps constructed to hold Jews, Gypsies, political and religious opponents, resisters, homosexuals, and other Germans considered "enemies of the state." Before the end of World War II, more than 100 concentration camps had been created across German-occupied Europe.
Quote:Throughout German-occupied Europe, the Germans arrested those who resisted their domination and those they judged to be racially inferior or politically unacceptable. People arrested for resisting German rule were mostly sent to forced-labor or concentration camps. The war brought unprecedented growth in both the number of camps and the number of prisoners. Within three years the number of prisoners quadrupled, from about 25,000 before the war to about 100,000 in March 1942. The camp population came to include prisoners from almost every European nation. Prisoners in all the concentration camps were literally worked to death. According to SS reports, there were more than 700,000 prisoners registered in the concentration camps in January 1945.
Extermination Camps (in German Vernichtungslager) were Nazi camps, equipped with gassing facilities, for mass murder of Jews. Located in Poland at Auschwitz-Birkenau, Belzec, Chelmno, Majdanek-Lublin, Sobibor, and Treblinka. Up to 2,700,000 Jews were murdered at these six camps, as were tens of thousands of Gypsies, Soviet prisoners of war, Poles, and others.
Quote:The Germans deported Jews from all over occupied Europe to extermination camps in Poland, where they were systematically killed, and also to concentration camps, where they were drafted for forced labor -- "extermination through work." Several hundred thousand Roma (Gypsies) and Soviet prisoners of war were also systematically murdered.
All of above quotations from
Nazi Camp System
List of Camps (not all of the more than 15,000, but the most complete [online] list)