A FIFO Queue, or First-In-First-Out Queue, is a data structure that processes items in the order they were added. This means that the first item added to the queue will be the first one to be removed. It operates like a line at a store, where the first customer in line is the first to be served. In a FIFO Queue, items are typically added at the back and removed from the front. This structure is commonly used in various applications, such as scheduling tasks in operating systems or managing requests in web servers, ensuring that all items are handled in the order they arrive.