Here's a TED.com Blog post published on Holocaust Remebrance day in 2013.
All over the world, Auschwitz has become a symbol of terror, genocide, and the Holocaust. It was established by Germans in 1940, in the suburbs of Oswiecim, a Polish city that was annexed to the Third Reich by the Nazis. Its name was changed to Auschwitz, which also became the name of Konzentrationslager Auschwitz. The direct reason for the establishment of the camp was the fact that mass arrests of Poles were increasing beyond the capacity of existing "local" prisons. Initially, Auschwitz was to be one more concentration camp of the type that the Nazis had been setting up since the early 1930s. It functioned in this role throughout its existence, even when, beginning in 1942, it also became the largest of the death camps.