How did ideas about race influence Nazi policies in Germany?

The racial policy of Nazi Germany was a set of policies and laws implemented in Nazi Germany based on a specific racist doctrine asserting the superiority of the Aryan race, which claimed scientific legitimacy. This was combined with a eugenics programme that aimed for racial hygiene by compulsory sterilization and extermination of those who they saw as Untermenschen, which culminated in the Holocaust. Nazi policies labeled centuries-long residents in German territory who were not ethnic Germans