Adolf Hitler and the Nazi party in Germany were proponents of a racist and antisemitic ideology called National Socialism, which included elements of social Darwinism. Social Darwinism is a controversial ideology that applies the concepts of natural selection and survival of the fittest from the theory of evolution to human society, and was used to justify colonialism and imperialism in the 19th and early 20th centuries.
Hitler and the Nazis used ideas from social Darwinism to justify their belief in the superiority of the "Aryan" race and their policy of racial purity. They believed that non-Aryan races were inferior and that it was the responsibility of the Aryan race to ensure its own survival and dominance over other races. This led to the horrific atrocities of the Holocaust, in which millions of Jews, Romani, homosexuals, and others deemed "undesirable" by the Nazi regime were systematically murdered.
It is important to note that the theory of evolution, as proposed by Charles Darwin, does not support the idea of racial superiority or the use of violence to achieve political goals. Darwin's theory of evolution by natural selection is a scientific explanation for the diversity of life on Earth and the common ancestry of all living things, and it has no inherent connection to social or political ideologies.
