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The classification of humans into populations or groups on the basis of various sets of characteristics. The most commonly used categories are based on visible traits, such as skin color, facial features, hair texture, and self-identification.

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This effort is supported by funding from the U.S. Centers for Disease Control and Prevention Environmental Public Health Tracking Program, Cooperative Agreement Number 5U38EH000619-02. The contents of this Website are solely the responsibility of the authors and do not necessarily represent the official views of the Centers for Disease Control and Prevention.