In modern communication systems, the efficiency of relays plays a critical role in determining overall network performance. Relays are devices or protocols that help extend the range of a network by forwarding data between nodes, ensuring that communication can occur over longer distances or through complex environments. As wireless networks evolve, particularly in 5G and beyond, relay technologies are gaining increased importance in enhancing the coverage and capacity of networks. To ensure these systems operate at their best, it is essential to evaluate their performance using specific metrics. In this article, we will explore the primary relay performance metrics, why they matter, and how they contribute to optimizing network efficiency.