Final answer:
People join groups to fulfill their social needs, engaging with others to create meaningful relationships and receive emotional support, known as solidary benefits.
Step-by-step explanation:
When people join groups because they want to interact with other people and develop meaningful relationships, it describes their need to fulfill social needs. This reason for joining groups is distinct from joining due to security, economic self-interest, or mutual interests. The drive to connect with others and build social networks for emotional support, companionship, and enjoyment aligns with what is known as solidary benefits. Such groups may offer a sense of belonging, an opportunity to compare oneself with others, and a platform for challenging one's beliefs and prejudices. Moreover, other reasons people join groups include utilitarian organizations where members receive tangible benefits, such as economic advantages or professional services. Groups can also form as a part of civic engagement, where individuals join to amplify their voice and impact on political or community issues. The desire for social interaction highlights the importance of relationships and personal fulfillment that comes from group participation.