Holocaust denial refers to the belief or assertion that the Holocaust, the systematic extermination of six million Jews and millions of others by the Nazi regime during World War II, did not occur as historically documented. Deniers often claim that the events were exaggerated or fabricated, despite overwhelming evidence, including survivor testimonies, documents, and the physical remains of concentration camps. This denial is widely discredited and condemned by historians and scholars. It is often associated with anti-Semitism and can contribute to the spread of hate and misinformation. Many countries have laws against Holocaust denial, recognizing it as a form of hate speech that undermines historical truth.