**What Is Data Structure C++?**

Data structures are an integral part of computer science and programming. They are the building blocks that allow us to store, organize, and manipulate data efficiently.

In C++, a powerful programming language, we have a wide range of data structures available at our disposal. In this tutorial, we will explore the various data structures in C++ and understand their uses.

**Arrays:**

An array is a collection of elements of the same type stored in contiguous memory locations. It allows us to store multiple values under a single name. For example:

```
int numbers[5] = {1, 2, 3, 4, 5};
```

**Linked Lists:**

A linked list is a dynamic data structure that consists of nodes linked together using pointers. Each node contains data and a pointer to the next node in the list.

Linked lists allow for efficient insertion and deletion operations compared to arrays. For example:

```
struct Node {
int data;
Node* next;
};
Node* head = nullptr;
Node* second = nullptr;
Node* third = nullptr;
head = new Node();
second = new Node();
third = new Node();
head->data = 1;
head->next = second;
second->data = 2;
second->next = third;
third->data = 3;
third->next = nullptr;
```

**Stacks:**

A stack is a last-in-first-out (LIFO) data structure where elements are added and removed from one end called the top. It follows the principle of “last in, first out.”

Stacks are used in various applications such as expression evaluation, function call management, and more. For example:

```
#include
```
std::stack myStack;
myStack.push(1);
myStack.push(2);
myStack.push(3);
int topElement = myStack.top(); // Retrieves the top element (3)
myStack.pop(); // Removes the top element (3)

**Queues:**

A queue is a first-in-first-out (FIFO) data structure where elements are added at one end called the rear and removed from the other end called the front. It follows the principle of “first in, first out.”

Queues are used in scheduling algorithms, simulations, and more. For example:

```
#include
```
std::queue myQueue;
myQueue.push(1);
myQueue.push(2);
myQueue.push(3);
int frontElement = myQueue.front(); // Retrieves the front element (1)
myQueue.pop(); // Removes the front element (1)

**Trees:**

A tree is a hierarchical data structure consisting of nodes connected by edges. It has a root node at the top and child nodes branching out from it.

Trees are used in various applications such as file systems, database indexing, and searching algorithms. For example:

```
struct Node {
int data;
Node* left;
Node* right;
};
Node* root = nullptr;
root = new Node();
root->data = 1;
root->left = new Node();
root->left->data = 2;
root->right = new Node();
root->right->data = 3;
```

**Conclusion:**

Data structures are essential tools in programming to efficiently store and manipulate data. In C++, we have a plethora of data structures available, each with its own advantages and use cases.

By understanding and utilizing these data structures effectively, we can optimize our programs for better performance and efficiency.