Final answer:
The 'Final Solution' was the term used by the Nazis for the genocide of European Jews during the Holocaust, orchestrated under the leadership of Heinrich Himmler, head of the SS.
Step-by-step explanation:
The term the Nazis used for the genocide of European Jews was the "Final Solution". This horrific event is known as the Holocaust, during which over six million Jewish people were systematically murdered. Moreover, the Holocaust resulted in the deaths of millions from other minority groups, emphasizing its vast destructiveness.
Heinrich Himmler was the head of the SS (Schutzstaffel) and played a key role in orchestrating the genocide. The Final Solution included the establishment of concentration camps, use of gas vans, mass shootings, and other methods of mass extermination. Himmler's efforts were central to the implementation of these systematic killings.