FCFS, or First-Come, First-Served, is a scheduling algorithm used in various systems, including computer processes and customer service. In this method, the first request received is the first one to be processed, ensuring a straightforward and fair approach. It is simple to implement and understand, making it popular in many applications. However, FCFS can lead to inefficiencies, especially if a long task arrives before shorter ones, causing delays known as the "convoy effect." This can result in increased waiting times for subsequent requests, making it less suitable for time-sensitive applications where responsiveness is crucial.