The Caucasian race (also Caucasoid, or Europid) is a grouping of human beings historically regarded as a biological taxon, which, depending on which of the historical race classifications used, have usually included some or all of the ancient and modern populations of Europe, the Caucasus, Asia Minor, North Africa, the Horn of Africa, Western Asia, Central Asia and South Asia.
In biological anthropology, Caucasoid has been used as an umbrella term for phenotypically similar groups from these different regions, with a focus on skeletal anatomy, and especially cranial morphology, over skin tone. Ancient and modern "Caucasoid" populations were thus held to have ranged in complexion from white to dark brown. In the United States, the root term Caucasian has also often been used in a different, societal context as a synonym for "white" or "of European ancestry".
First introduced in early racial typologies and anthropometry, the term denoted one of three purported major races of humankind (Caucasoid, Mongoloid, Negroid). Since the second half of the 20th century physical anthropology has moved away from a typological understanding of human biological diversity towards a genomic and population based perspective, and they have tended to understand race as a social classification of humans based on phenotype and ancestry as well as cultural factors, as the concept is also understood in the social sciences. However, "Caucasian" and "Caucasoid" as a biological classification remains in use in forensic anthropology where it is sometimes used as a way to identify the ancestry of human remains based on interpretations of osteological measurements.