Final answer:
Initially, the Nazis' built concentration camps in 1933 to detain political prisoners and those they saw as undesirable. These camps evolved into a network for forced labor and execution, and later, distinct extermination camps were developed for mass murders, contributing to the Holocaust.
Step-by-step explanation:
In 1933, the Nazis initially built concentration camps to detain and confine political prisoners, as well as various groups they deemed undesirable. The first of these camps, Dachau, was established on March 22, 1933, not long after Hitler became chancellor of Germany.
These camps were controlled by the SS, and were places of unsanitary conditions, inadequate resources, forced labor, and mass execution. Over the years, the purpose of the concentration camps broadened, eventually becoming part of the Holocaust.
Alongside these camps, extermination camps were created specifically for mass murder, most notably in occupied Poland.
They were not intended for holding prisoners long-term, but rather for quick and systematic killing, often within hours of arrival. This distinction marks the evolution of the Nazi's methods of genocide, from forced labor and various forms of execution, to the industrialized killing process of the extermination camps.