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Ingroup bias is favoring one's own group over other groups.
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Outgroup Homogeneity Effect: The perception that individuals in the outgroup are more similar (homogeneous) than they really are, as well as more similar than the members of the ingroup.
A preconceived opinion about someone based on their membership in a particular group, which isn't based on reason or actual experience.
Unjust treatment of different categories of people or things, especially on grounds such as race, age, or sex.