Welcome to our exploration of queues and deques using Kotlin. These data structures frequently appear in everyday programming, managing everything from system processes to printer queues. In this lesson, our goal is to understand and implement queues and deques in Kotlin using MutableList. Let's dive in!

A queue, similar to waiting in line at a store, operates on the "First In, First Out" or FIFO principle. Kotlin's MutableList can be used to implement queues. We can add items to the end of the list and remove items from the start, making use of add() and removeFirstOrNull().

The dequeued item, "Apple", was the first item we inserted, demonstrating the FIFO principle of queues.

Before trying to remove items from our queue, let's ensure it is not empty. This precaution will prevent runtime errors when attempting to dequeue from an empty queue.