What happened in concentration camps during the Holocaust?

There were extermination camps in Germany and Poland as well as many other European countries. There were concentration camps all over Europe in many more countries.

In either forced labor camps or death camps, most inmates were worked until they died. Filthy conditions, no medicines, and lack of food led to many deaths by starvation and disease. The people sent to these camps were treated in a totally callous, malicious, and inhumane manner. The death camps were part of Hitler's "Final Solution" (genocide of the Jews), although gypsies and ethnic Polish populations were subject to the same type of methodical extermination.