Answer:
Auschwitz was a concentration and extermination camp.
It was the largest camp out of all of them.
It was the first camp to have gas chambers.
People that were in Auschwitz were told as they entered that if they worked hard, they would be set free (which was a lie).
The banner going into Auschwitz said "Arbeit Macht Frei", which is German for ' work makes one free'.