The first Nazi concentration camps set up in Germany were greatly expanded after the Reichstag fire of 1933, and were intended to hold political prisoners and opponents of the regime.
The camps built by the Third Reich mostly between 1939 and 1942, were intended to hold large groups of prisoners including Jews, gypsies, Slavs, prisoners of war and many others, seen as undesirable by the occupation administration. In modern historiography, the term refers to a place of mistreatment, starvation, forced labour, and murder.
Holocaust scholars draw a distinction between concentration camps and extermination camps, which were established by the Nazis for the industrial-scale mass murder of the predominantly Jewish ghetto and concentration camp populations.
According to data presented in the table below, an estimated 4,251,500 people lost their lives in the camps.