A Single-Server Queue is a system where a single server processes requests or tasks from a line of waiting customers or items. This model is commonly used in various settings, such as banks, restaurants, and call centers, where one person or machine serves multiple clients in a sequential manner. The queue operates on a first-come, first-served basis, meaning that the first customer in line is the first to be served. In this type of queue, the performance can be analyzed using metrics like average wait time and server utilization. The queueing theory helps in understanding these dynamics, providing insights into how to optimize service efficiency. By studying these systems, businesses can improve customer satisfaction and reduce wait times.