In this article, we will know what is the stack? Also, we will know the operation of the stack and the position of stack, why the **stack** is used in **data** **structure**? And where the stack is used in **computer** **science**.

## What is a stack in a data structure?

A stack is a** linear data structure**. Which stores the data in sequential order.

Stacking using an array. The stack follows the principle of **FILO**(first in last out) or **LIFO** (last in first out).

There are two operations that can be performed with a stack called **PUSH** and **POP**.

One **END** of the stack called the top of the stack.

## What is PUSH and POP in the stack?

#PUSH = This operation is performed when data is **inserted** into the stack.

#POP = This operation is performed when the data in the stack is **removed**.

## What is insertion and deletion in the stack?

- Insertion means
**inserting**data inside the stack. - Deletion means
**deleting**the data inside the stack.

There are two conditions that occurred in a stack called “stack overflow” and “stack underflow”.

## What are stack overflow and stack underflow in the stack?

A **stack** **overflow** condition occurs when we perform a PUSH operation. The **stack** **underflow** condition occurs when we perform a POP operation. The stack is used in the compiler to **solve** **arithmetic equations**.

#### Answered some of your questions

## Where can you use the stack in your program?

The main use of the stack is to check the **prefix**, **postfix**, and **infix** **expression**.

Prefix, postfix, and infix expressions are represented by the stack.itself and are used to convert one expression to another. The stack is used to solve arithmetic equations in the compiler.

## In which case the stack does not have insertion and deletion performance?

When the value of the TOP pointer variable in the stack is greater than or equal to the value of the stack (when the stack is full) and data cannot be inserted into the stack.

When the value of the TOP pointer variable in the stack is less than or equal to the stack (when the stack is empty) and the data in the stack cannot be removed.