What Are the Applications of Queue Data Structure?


Larry Thompson

The Queue data structure is a fundamental concept in computer science and finds its applications in various domains. In this article, we will explore some of the key applications of the Queue data structure and understand how it can be used to solve real-world problems.

1. Simulations

Queues are widely used in simulations to model real-life scenarios.

For example, consider a queue of customers waiting in line at a bank. The first customer to arrive is the first one to be served, while new customers join the queue at the end. This behavior can be efficiently represented using a Queue data structure, where elements are added at one end (enqueue) and removed from the other end (dequeue).

2. Task Scheduling

In operating systems, queues are used for task scheduling.

The tasks or processes are enqueued based on their priority or arrival time, and the scheduler picks tasks from the front of the queue for execution. This ensures fairness and allows for efficient allocation of system resources.

3. Print Spooling

In print spooling systems, a queue is used to manage print jobs submitted by different users.

The jobs are added to the queue and processed one by one in a first-come-first-served manner. This not only allows multiple users to share a printer but also prevents conflicts that may arise when multiple print jobs try to access the printer simultaneously.

4. Breadth-First Search (BFS)

BFS is a graph traversal algorithm that explores all vertices of a graph in breadth-first order.

It uses a Queue data structure to keep track of which vertices should be visited next. Starting with an initial vertex, BFS explores all its neighbors before moving on to their neighbors, thus visiting vertices in levels or layers.

5. Buffering

Queues are commonly used for buffering in data processing systems.

For example, when data is transmitted over a network, it may arrive at a faster rate than it can be processed. In such cases, the incoming data is stored in a queue until the processing system is ready to handle it.


The Queue data structure has a wide range of applications in computer science and beyond. It provides an efficient way to manage elements in a first-in-first-out manner, making it suitable for scenarios where order and precedence matter. From simulations to task scheduling, print spooling to graph traversal, and buffering to message passing systems, queues play a crucial role in solving various problems.

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