What Is FIFO Data Structure?


Larry Thompson

What Is FIFO Data Structure?

In computer science, a FIFO (First-In-First-Out) data structure is an abstract concept that represents a collection of elements where the first element added is the first one to be removed. It follows the principle of “first come, first served.”

The Basics of FIFO

Imagine a queue in real life, such as people waiting in line for a movie. The person who arrives first gets to enter the theater first. Similarly, in a FIFO data structure, the element that enters the collection first will be the first one to leave.

A FIFO data structure can be implemented using various programming constructs like arrays, linked lists, or queues. However, queues are specifically designed to implement this concept efficiently.

Operations on FIFO Data Structure

A typical FIFO data structure supports two main operations:

  • Enqueue: This operation adds an element to the end of the data structure. The newly added element becomes the last one in line.
  • Dequeue: This operation removes and returns the first element from the data structure. The second element then becomes the new “first” element.

The enqueue and dequeue operations maintain the integrity of the FIFO order by preserving and updating pointers or indices accordingly.

Real-World Applications

FIFO data structures find applications in various real-world scenarios:

  • Scheduling algorithms: Operating systems often use queue-like structures to manage processes and determine their execution order based on priority or arrival time.
  • Breadth-first search (BFS): In graph traversal algorithms, a FIFO data structure such as a queue is used to process nodes in the order they were discovered.
  • Buffering: When data is received faster than it can be processed, a FIFO buffer helps store and manage the incoming data until it can be handled properly.


FIFO data structures provide a simple yet effective way to manage collections of elements based on the principle of “first come, first served.” By understanding the basics of FIFO and its applications in various domains, you can leverage this concept to solve problems efficiently in your programming endeavors.

Discord Server - Web Server - Private Server - DNS Server - Object-Oriented Programming - Scripting - Data Types - Data Structures

Privacy Policy