January 27th is significant as it marks Holocaust Memorial Day, which commemorates the liberation of Auschwitz concentration camp in 1945 and honors the victims of the Holocaust and other genocides. Genocide is defined by the UN as killing or harming people because of their race, religion, or ethnicity with the intent to destroy the group. The Holocaust is the most well-known genocide, in which Nazi Germany systematically murdered around 6 million European Jews as well as Roma, Slavs, homosexuals, disabled people and others. Holocaust Memorial Day promotes tolerance and understanding between different groups.