What Is Stack in Data Structure PPT?


Larry Thompson

A stack is a fundamental data structure in computer science that follows the Last-In-First-Out (LIFO) principle. In simpler terms, a stack is like a pile of plates where the last plate placed on top is the first one to be removed. In this article, we will explore the concept of a stack in data structures and how it can be implemented using PowerPoint presentations.

Understanding Stacks:
A stack is an abstract data type that represents a collection of elements. It provides two main operations: push and pop. The push operation adds an element to the top of the stack, while the pop operation removes and returns the topmost element.

Visualizing a Stack:
Imagine a vertical arrangement of elements, where each element is placed on top of another. The topmost element represents the current state or top of the stack. You can think of it as a pile of books, where you can only add or remove books from the top.

Stack Implementation Using PowerPoint

Creating a PowerPoint presentation to visualize stacks can be an effective way to demonstrate their functionality. Let’s look at how we can achieve this using HTML tags:

Step 1: Create a Blank Slide

Start by creating a blank slide in your PowerPoint presentation. This slide will serve as our canvas for visualizing the stack.

Step 2: Add Elements

To simulate pushing elements onto the stack, add several shapes or text boxes to your slide. Each shape or text box represents an element in the stack. Place them vertically on your slide, with each new element added on top of the previous one.

Step 3: Styling Elements

To make it visually appealing, you can apply different styles to each shape or text box representing an element in your stack. Use bold text () to emphasize important details or labels. You can also underline () specific elements to draw attention.

Step 4: Animation Effects

To demonstrate the push and pop operations, you can use PowerPoint animation effects. For example, when simulating the push operation, you can add an animation that makes the new element appear on top of the stack. Similarly, for the pop operation, you can remove the topmost element using an appropriate animation effect.

Main Operations on a Stack:

Stacks support various operations apart from push and pop. Let’s explore a few of them:


The peek operation returns the topmost element of the stack without removing it. It allows you to examine the value at the top without modifying the stack’s state.


The isEmpty operation checks whether a stack is empty or not. It returns true if there are no elements in the stack; otherwise, it returns false.


The size operation returns the number of elements present in the stack at any given time.

  • Push Operation: Adds an element to the top of the stack.
  • Pop Operation: Removes and returns the topmost element from the stack.
  • Peek Operation: Returns the topmost element without removing it.
  • isEmpty Operation: Checks if the stack is empty.
  • Size Operation: Returns the number of elements in the stack.

A Real-World Example – The Call Stack

One practical application of stacks is in programming languages’ execution model. When a function is called, the program’s execution is temporarily paused, and the function’s context is pushed onto a call stack. Once the function completes its execution, its context is popped from the stack, and the program resumes from where it left off.

In conclusion, a stack is a crucial concept in computer science and data structures. By visualizing stacks using PowerPoint presentations with proper styling elements and animation effects, you can effectively communicate and demonstrate their operations.