The primary function of predator-prey interactions in ecosystems is to regulate population dynamics and maintain ecological balance. These interactions facilitate natural selection, where predators help control prey populations, preventing overgrazing or depletion of resources. By keeping prey populations in check, predators promote biodiversity, as more species can coexist within a healthy ecosystem. Additionally, predator-prey dynamics contribute to energy flow through food webs, influencing ecosystem structure and function. Understanding these interactions is essential for effective wildlife management and conservation strategies.