In today's world, networking and the associated opportunities for exchange are advancing rapidly. More and more people are engaging in a virtual parallel world, where the real and virtual worlds increasingly influence each other. Thus, it is not easy to determine who is truly a friend and who is not. Is a friend made online equivalent to a "real" friend? Are there differences between friendships formed online and those formed offline? How do friendships develop in today's time? As social media and their influence on our daily lives continue to grow in importance, these questions are relevant for society to understand how we, as relationship-seeking beings, are changing through them. This book not only discusses the emergence of the concept of friendship but also analyzes the topic in depth.