# Auschwitz a city in southwestern Poland which was the location of a Nazi concentration camp during World War II. This and similar Nazi camps, such as Belsen, were the sites for detention of many millions of people who the Nazis labeled undesirable (most notably the bulk of the Jews of Europe). More than six million people were eventually exterminated in these camps. Those who were not killed outright were ill treated, many subjected to cruel experimentation and torture, and great masses died of disease or starvation. See also Belsen in this glossary.