Peer influence is an instrument of change, with outcomes that are not preordained: The same processes that make influence a source of harm also make it a valuable interpersonal resource. Yet the benefits of peer influence are insufficiently appreciated. Knowing when and how much to conform to the wishes of others is an important skill that children must acquire to adjust to and thrive in a social world dominated by peers. Peer influence can be an adaptive strategy whose benefits outweigh the costs that sometimes arise in its application. To overlook the adaptive consequences of peer influence is to miss the main point of conformity, which is to foster harmony between individuals and secure their interpersonal, physical, and mental well-being.