Explain the nazi ideology of racial purity

Hitler believed in the "cleansing" of human races. He sought to create an "anglo saxon race, which means blonde and blue eyed people. Hitler believed that if his plan were to work, these "pure" humans would need a place to live, this was called the "lebenstraum". Therefore, the Nazi Army began to drive out Jews, Gypsies, and Homosexuals, sending them to camps where they were eventually eliminated.