What is the difference between in-group bias and out-group homogeneity?

In-group bias, also called in-group favoritism, is the tendency to favor members of one's own group over members of other groups. People rate in-group members as more likeable, trustworthy, and competent, and allocate more resources to them. Out-group homogeneity is the perception that members of other groups are all alike while members of one's own group are diverse individuals. People see nuance and variation in their own group but view outsiders as interchangeable. Both biases strengthen with competition between groups and contribute to prejudice and discrimination.