Adolf Hitler was a German political leader and dictator who led the Nazi Party and served as Chancellor of Germany from 1933 to 1945. He is infamous for initiating World War II in 1939 and for his central role in the Holocaust, the systematic genocide of six million Jews, as well as millions of others, including Roma, disabled individuals, and political opponents.Hitler's aggressive expansionist policies and militarism led to the conquest of much of Europe. His regime was marked by extreme nationalism, anti-Semitism, and the pursuit of an Aryan racial superiority doctrine. The war ended in 1945 with Germany's defeat and Hitler's suicide in April of that year.His actions and ideology had devastating global consequences, and he remains one of the most infamous figures in world history.