What Is Queues in Data Structure?


Larry Thompson

Queues are an essential data structure in computer science and programming. They are used to store and manage a collection of elements in a specific order. In this article, we will explore queues in detail, discussing their definition, properties, operations, and applications.


A queue is a linear data structure that follows the First-In-First-Out (FIFO) principle. This means that the element that is inserted first will be the first one to be removed. It can be visualized as a real-life queue or line where people stand in the order they arrive, and the person at the front is served first.


  • Order: The elements in a queue are ordered based on their insertion time. The first element inserted is always at the front of the queue, while the last element inserted is at the rear.
  • Insertion: Elements are inserted at the rear of the queue.
  • Deletion: Elements are deleted from the front of the queue.
  • Access: Only the front element of the queue can be accessed or viewed.


A queue supports two primary operations: enqueue and dequeue.

  • Enqueue: This operation involves inserting an element at the rear end of the queue. The newly added element becomes the new rear of the queue.
  • Dequeue: This operation involves removing an element from the front end of the queue. The next element in line becomes the new front of the queue.

In addition to enqueue and dequeue, some other common operations performed on queues include:

  • isEmpty: Checks if the queue is empty.
  • isFull: Checks if the queue is full.
  • peek: Returns the element at the front without removing it.


Queues find applications in various domains, including:

  • Operating Systems: Queues are used for scheduling processes and managing system resources.
  • Data Communication: Queues are used to manage data packets during transmission.
  • Breadth-First Search (BFS) Algorithm: Queues are used to traverse and search graph structures in a breadth-first manner.
  • Print Spooling: Queues are used to manage print jobs sent to printers in order.

In Conclusion

In summary, queues are an important data structure that follows the FIFO principle. They are widely used in various applications, ranging from operating systems to data communication. Understanding queues and their operations is essential for efficient algorithm design and problem-solving in programming.

I hope this article has provided a comprehensive overview of queues in data structures. With this knowledge, you can now incorporate queues into your programming projects effectively!

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