"Us vs. Them" refers to a social dynamic where individuals or groups categorize themselves as part of an in-group (us) and others as an out-group (them). This division can lead to feelings of loyalty and solidarity within the in-group, while fostering suspicion or hostility towards the out-group. Such distinctions can arise from various factors, including race, nationality, politics, or religion. This mindset can influence behavior and attitudes, often resulting in conflict or discrimination. It is commonly observed in situations like sports rivalries, political campaigns, or cultural debates, where the emphasis on differences can overshadow shared values and common goals.