The National Socialist camp system consisted of a wide variety of camp types which differed in various degrees with regard to structure, function, organization, size and length of existence. Considering the metamorphoses and functional changes many camps underwent, it is extremely difficult to subsume them into a specific camp type. Therefore the various categorizations give only a first hint to the actual camp type. Political opponents, Jews, Sinti and Roma, homosexuals, Jehova's witnesses and so called asocials were incarcerated in concentration camps. In addition to these camps there were transit camps, ghettos, homes in which handicapped people were killed and camps for forced laborers and prisoners of war. The total number of camps reaches tens of thousands.