Long ago, a bad group did unfair things. 
During a big war, a bad group did very bad things. 
During World War II, Nazi Germany used six extermination camps. 
The Nazis tried to keep the camps a secret. They used fake names for their work. They called the killings "special treatment." They told people they were just moving to new homes. This was a lie. 
Most of these camps were built to kill people quickly. They used gas to do this. Some camps used gas from large engines. Others used a chemical called Zyklon B. The six camps were Chełmno, Bełżec, Sobibor, Treblinka, Majdanek, and Auschwitz-Birkenau. Some camps also used forced labor. This means people were made to work hard. Many people died from hunger or disease. We study this history to remember what happened.
During World War II, Nazi Germany used special sites to kill many people. These were called extermination camps or death camps. 
The camps worked in a very organized and cruel way. The Nazis often lied to the people being moved. They told them they were being "resettled" or sent to work. 
This system did not start all at once. It grew from earlier, secret programs. The Nazis had already tested using poison gas in a program called Aktion T4. That program targeted hospital patients with disabilities.
There were six main extermination camps. These were Chełmno, Bełżec, Sobibor, Treblinka, Majdanek, and Auschwitz-Birkenau. 
It is important to know the difference between these camps and others. Many people also died in concentration camps. Concentration camps were often used to hold people as prisoners or for forced labor. 
Extermination camps were specialized sites used by Nazi Germany during World War II. These sites are also called death camps or killing centers. Their primary purpose was the systematic murder of large groups of people. Most of these camps were located in Central Europe. Many were built in German-occupied Poland. This was because Poland held a very large Jewish population. The Nazis used these camps to carry out a plan called the "Final Solution." This was a state-sponsored plan to murder the Jews of Europe. Over 2.7 million people died in these specific camps. 
The Nazis used specific methods to carry out these murders. Most victims were killed using gas. Some camps used gas vans to release poisonous exhaust fumes. Other camps used permanent installations built for this purpose. In camps like Treblinka, Bełżec, and Sobibór, they used exhaust from large internal combustion engines. At Auschwitz-Birkenau and Majdanek, they used a chemical called Zyklon B. This chemical was a cyanide-based substance. The Nazis often lied to victims to keep the process secret. They used terms like "resettlement," "evacuation," or "special treatment" in their letters.
There were six main extermination camps. These were Chełmno, Bełżec, Sobibór, Treblinka, Majdanek, and Auschwitz-Birkenau. These camps can be divided into two different types. The first type included the Operation Reinhard camps. These were Bełżec, Sobibór, and Treblinka. These sites were built only for rapid killing. People were often murdered within hours of their arrival. The second type included Auschwitz-Birkenau and Majdanek. These were part of larger labor camp complexes. In these camps, some people were used for forced labor before they died. 
This system grew from earlier Nazi programs. In 1939, the SS started a secret program called Aktion T4. This program murdered hospital patients with mental or physical disabilities. The Nazis used poison gas during this program. They then adapted this technology for the extermination camps. In 1941, the Nazi-Soviet war began. This led to the start of Operation Reinhard. In January 1942, the Wannsee Conference was held. Leaders like Reinhard Heydrich chaired this meeting. They made the plan for the "Final Solution" clear. Adolf Eichmann was responsible for the logistics of these deportations. 
The logistics of the camps were very organized. The camps were often built near railway branch lines. This made it easier to move people by train. The SS managed the operations of these camps. For example, Odilo Globocnik oversaw the Operation Reinhard camps. These camps were run by a small number of SS men. They were assisted by many others, including Trawniki auxiliaries from Soviet Ukraine. They also used up to one thousand slave laborers. These laborers were often forced to remove corpses or burn bodies.
It is important to distinguish these from concentration camps. Nazi Germany had many concentration camps in Germany. Examples include Dachau, Buchenwald, and Sachsenhausen. These were prison camps used to hold people considered "undesirable." While many people died in concentration camps from hunger or disease, they were not built solely for mass murder. During the Nuremberg trials, officials clarified this difference. They noted that Auschwitz and Majdanek were extermination camps. Other sites like Mauthausen were classified as normal concentration camps. 
The impact of this system was massive. The Jews were the primary target of the extermination camps. They accounted for over 90 percent of the victims. Other groups, such as the Roma and Soviet prisoners of war, were also killed. Beyond the camps, the Nazis used other methods of killing. They carried out the "Holocaust by Bullets" in many places. Soldiers shot people near ravines in locations like Ponary and Rumbula. This was part of a wider system of genocide that changed the history of Europe forever.
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