1) The document summarizes research on the nature and sources of prejudice. It defines prejudice as a preconceived negative judgment of a group and its members, supported by stereotypes.
2) Prejudice stems from social sources like social inequalities and socialization, motivational sources like feeling superior to outgroups, and cognitive sources like categorization and perception of distinctiveness.
3) The consequences of prejudice include self-perpetuating stereotypes through confirmation bias, and discrimination that can create self-fulfilling prophecies about the targeted groups.