Friendship is a complex social construct that has deep roots in biological and evolutionary processes. The propensity to form friendships is not only observed in humans but also in various animal species, suggesting an evolutionary advantage to these social bonds. In humans, the neurobiological mechanisms underlying friendship involve a combination of hormonal and neurological factors that influence behaviors conducive to forming and maintaining social connections. From an evolutionary standpoint, friendships may have developed as a strategy for survival and resource sharing. The exchange theory posits that social behavior, including friendship, is the result of a calculated exchange process where individuals weigh potential benefits and risks [20]. This aligns with the evolutionary concept that individuals who form cooperative alliances are more likely to thrive in their environments. Additionally, the traits of extroversion and agreeableness, which are beneficial in forming friendships, may have been favored through natural selection as they enhance social connectivity and support [19]. Moreover, cultural and familial norms also play a significant role in the evolution of friendship, as societies use these elements to influence how and when friendships are formed [27][30]. The integration of these cultural norms with biological predispositions underscores the complexity of friendship as both a biological necessity and a culturally modulated phenomenon. In contemporary contexts, the biological imperatives of friendship must now contend with technological influences. While technology acts as a catalyst for social exchange and innovation, there is growing concern that over-reliance on digital communication may impede the biological benefits of face-to-face interactions, potentially reducing empathy and increasing misunderstandings [31][32]. Understanding the biological and evolutionary aspects of friendship can thus provide insight into both its enduring nature and its adaptive challenges in the modern world.