Adolf Hitler was the leader of Nazi Germany from 1934 to 1945, known for his role in instigating World War II and the Holocaust, which led to the deaths of millions. He rose to power as the head of the National Socialist German Workers' Party (Nazi Party) and implemented totalitarian policies that emphasized nationalism and anti-Semitism. Hitler's aggressive expansionist policies and militarization ultimately resulted in widespread destruction across Europe. He died by suicide in April 1945 as Allied forces closed in on Berlin.