# Difference between Stack and Queue Data Structure

By Anjnee Bhatnagar|Updated : September 23rd, 2022

The difference between Stack and Queue arises from their approach to storing data. Stack and Queue are linear data structures used to store and organize data. The major difference between Stack and Queue is that stack follows LIFO whereas queue follows FIFO.

To discuss the difference between stack and queue, we will see the meaning of data structure, types of data structure, stack data structure, and queue data structure.

## Difference Between Stack and Queue

Having discussed the data structures, their types, stack data structure, and queue data structure, now we will see the difference between Stack and Queue. Though both stack and queue belong to the linear data structures, differences exist based on the operations and features each offers to the programmer or user.

### Key Differences Between Stack and Queue

 Stack Queue Elements are inserted or deleted from the same end, called the stack's top. Elements are inserted and deleted respectively from the rear and front end of the queue. Stack follows LIFO Queue follows FIFO Stack uses push and pop operations to insert and delete data, respectively. Queue uses 'en queue' and 'de queue' operations to insert and delete data. A stack has no further division. A queue is divided into the circular queue, priority queue, and double-ended queue. Implementation is simple. Implementation is complex. Used in expression evaluation, undo, and redo operations. Used in assigning processes, ready queue, waiting for a queue, etc.

## What is a Data Structure?

Data may be organized in many different ways. The logical or mathematical organization of data is called the data structure. Programming languages use data structures to store, manipulate, access, and organize data. Algorithms are implemented using these data structures.

### Difference between Stack and Queue PDF

The data structures are broadly classified into two categories based on their operations. The two categories are a Linear data structure and a Non-linear data structure. We have linear arrangements of data in the linear data structure, while in the non-linear data structure, the data is stored in the form of trees, tables, etc. Despite the difference between Stack and Queue, both stack and queue belong to the linear data structures. ## What is a Stack Data Structure?

A stack is an abstract data type (ADT). A real-world stack allows operation at one end only. At any given time, we can only access the top element of a stack. This feature makes it a LIFO data structure. LIFO stands for Last In First Out. The operational difference between stack and queue involves LIFO and FIFO (First In, First Out); we will learn about FIFO in the queue data structure. The basic operations of the stack data structure are:

1. push(): Insert an element into the stack.
2. pop(): Removing an element from the stack.
3. peek(): Get the top element of the stack without removing it.
4. isFull() : Checks if the stack is full.
5. isEmpty(): Checks if the stack is empty.

## What is a Queue Data Structure?

A queue is an abstract data structure similar to a stack. Unlike stacks, a queue is open at both ends. One end is always used to insert data, and the other is to remove data from the queue. Queue follows the FIFO methodology. The end at which insertions take place is called the rear end of the queue and the end at which deletion takes place is called the front of the queue. The basic operations of queue data structures are:

• enqueue() : To insert an item into the queue.
• dequeue() : To remove an element from the queue.
• peek(): To get the element from the front of the queue without removing it.
• isFull() : Checks if the queue is full.
• isEmpty() : Checks if the queue is empty.

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## FAQs Difference Between Stack and Queue

• A stack data structure follows the LIFO methodology while a queue data structure follows the FIFO methodology. LIFO stands for Last in first out. FIFO stands for First in first out. A stack with LIFO is a simple to build data structure using an array.

• The difference between stack and queue is that queue can further be divided into three types, i.e., circular, priority, and double-ended. In contrast, the stack does not have any further division.

• The differences between stack and queue reveal each one has its operational features. The stack data structure is simple to implement and has applications in expression evaluation, balancing parentheses, performing undo, redo operations, etc.

• A data structure is used to organize data mathematically or logically. Data structures are broad of two types linear and non-linear. The linear data structures involve arrays, linked lists, stacks, and queues. Non-linear include graphs, trees, sets etc.

• A queue data structure involves various operations to be performed by the user like enqueue, dequeue, peek, etc. The major operations to insert and delete elements from queue data structure are called enqueue and dequeue respectively.

• A stack data structure follows LIFO. All operations are performed on the same end of the stack. The stack operations are: pop(), push(), peek(), isFull(), and isEmpty().

• The difference between stack and queue based on implementation is that stack can be implemented easily, whereas queue can not be implemented that easily. Implementation of the queue is a bit complex as compared to stack.

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