In modern wireless communication systems, ensuring high data rates, extensive coverage, and low latency is a critical challenge. One effective way to overcome these challenges is through the use of Relay Selection. This process involves choosing the optimal relay nodes in a network to assist in the transmission of data from a source to a destination. Relay selection plays a pivotal role in various advanced communication technologies, including 5G, LTE, and Wi-Fi, by improving signal quality, expanding coverage, and increasing system capacity. This article delves into the concept of relay selection, its importance, strategies, and applications in wireless networks.