Adolf Hitler was born on April 20, 1889, in Braunau am Inn, Austria. His birthday is often noted in historical discussions due to his role as the leader of Nazi Germany from 1934 to 1945. Hitler's policies led to World War II and the Holocaust, resulting in the deaths of millions. In some countries, Hitler's birthday is marked by neo-Nazi groups and other extremist organizations, who may use the date to promote their ideologies. This has led to increased security measures in certain areas to prevent hate crimes and public disturbances associated with these gatherings.