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Social categories both create and reflect inequality. Macro, overarching forces, and individual, perceiver biases each contribute. First, we review perspectives deriving from classic sociological and prevailing psychological social psychology, including both interpersonal fluidity and cognitive economy. Social psychologists have implicated several specific categories in social inequality. We then discuss the two that have garnered the most focus (race and gender), and next the less-studied ones (age disability, sexuality, social class, and weight). Afterward, we focus on a theory that ties together all these categories, the stereotype content model. Other structural, group-based hierarchy perspectives compliment these perspectives. Broader perspectives from social cognition highlight how categories are often automatic, at times ambiguous and ambivalent, often complex, and ultimately driven by stereotype content …