This document discusses interpersonal attraction and why people are drawn to others. There are two main reasons for affiliation - social comparison and social exchange. Social comparison involves evaluating ourselves by comparing to similar others, while social exchange means seeking relationships where rewards outweigh costs. Additionally, people are motivated by five core social motives - belongingness, understanding, controlling, self-enhancement, and trust. Factors like proximity, similarity, and physical attractiveness can influence attraction. People prefer others who are similar in attitudes and validate their self-views due to desires for social comparison, familiarity, and cognitive consistency.