Holocaust deniers are individuals or groups who reject the established historical facts about the Holocaust, the systematic genocide of six million Jews and millions of others by the Nazi regime during World War II. They often claim that the events were exaggerated, fabricated, or did not occur at all, despite overwhelming evidence from historical documents, survivor testimonies, and the findings of numerous investigations. These deniers may promote conspiracy theories and often rely on selective interpretations of evidence to support their views. Their beliefs are widely discredited by historians and scholars, and they are often associated with anti-Semitism and other forms of hate.