Final answer:
An in-group is a group that we identify with, while an out-group is a group that we view as fundamentally different from us. In-group bias refers to our preference for our own group over other groups, which can result in prejudice and discrimination towards the out-group. Ingroup homogeneity and outgroup homogeneity refer to the perception of similarity within and between groups.
Step-by-step explanation:
An in-group is a group that we identify with or see ourselves as belonging to, while an out-group is a group that we view as fundamentally different from us. In-group bias refers to our preference for our own group over other groups, which can result in prejudice and discrimination towards the out-group. Ingroup homogeneity refers to the perception that members of our own group are more similar to each other than they actually are, while outgroup homogeneity refers to the perception that members of other groups are more similar to each other than they actually are.