Caucasian, Negroid and Mongoloid are the three principal examples of human racial designations. White, black and Asian are the layman's terms for these races. Other scholars consider Native American and Pacific Islander as separate races.
Caucasian humans primarily come from Europe, Australia and North America. Caucasians tend to have light skin tone, a high forehead and a long, narrow nose. Negroid humans primarily live in Africa, while the historical dispersion caused by the slave trade allowed the race to become heavily visible in Europe and the Americas. Negroids tend to have a dark skin tone, a high forehead and a short, broad nose. Mongoloid humans primarily live in Asia. Mongoloids tend to have a light skin tone, a short round head and a short, broad nose.