The T4 Euthanasia Program was a covert Nazi initiative aimed at systematically exterminating individuals deemed 'unfit' for society, including the disabled, mentally ill, and others who did not fit into the Nazi ideology of racial purity. This program not only reflected the extreme beliefs of the Nazis regarding the value of human life but also set the stage for the broader genocidal policies that would later culminate in the Holocaust. The program was named after the address of its headquarters at Tiergartenstrasse 4 in Berlin, and it operated under a facade of compassion and medical care.