RationalWiki:Webshites/Racialism/Description

Racialism is the idea that humanity can be easily divided into well-defined categories ("races") that are both broad (each category should include many humans, such as entire continents) and clearly-defined (the categorization method should rarely misidentify someone's "race"). Racialism implies that these races are substantially different from each other and strongly determine abilities and behavior, to the degree that biological classification below the species level is necessary. In short, racialism holds that biology divides humans.