Answer: ingroups and outgroups
Explanation: An outgroup is any group that you don't belong or associate yourself with, while an ingroup is a group that you associate yourself with and both form the basis for social hierarchies. Groups play an important role in our perception of those that are “like us” and those that we feel are “different from us”. The group in which we associated strongly with are in groups while out group are group in which we have low social relation with.
