The Jewish Holocaust.

The genocide in the 1940s refers to the systematic and deliberate mass murder of millions of people by Nazi Germany and its collaborators during World War II. The most well-known aspect of this genocide was the Holocaust, in which the Nazis targeted and killed six million Jews.

However, the Nazis also targeted other groups for extermination, including Romani people, people with disabilities, homosexuals, Jehovah's Witnesses, and others deemed "undesirable" by the Nazi regime. In addition to these groups, the Nazis also carried out a brutal campaign against Slavs and other Eastern European peoples, which resulted in the deaths of millions more.

The genocide was carried out through a variety of methods, including mass shootings, gas chambers, and forced labor camps. The Nazis also used mobile killing squads, known as Einsatzgruppen, to round up and kill large numbers of people.

The genocide in the 1940s had a profound impact on the world, both in terms of the scale of the atrocities committed and the lasting legacy of the trauma inflicted on survivors and their families. The Holocaust in particular remains one of the most significant and studied events in modern history, and its lessons continue to shape our understanding of the dangers of prejudice and hatred.