Human races refer to the classification of people based on physical characteristics, such as skin color, facial features, and hair type. Traditionally, these classifications have included categories like Caucasian, Asian, African, and Indigenous peoples. However, it is important to note that these categories are not scientifically rigorous and often overlap, as human genetic diversity is vast. Modern science emphasizes that all humans belong to a single species, Homo sapiens, and that the concept of race is more of a social construct than a biological fact. Genetic studies show that there is more variation within racial groups than between them, highlighting the shared ancestry of all humans.