What Is Node in Data Structure Using C?


Scott Campbell

Node in Data Structure is an essential concept to understand when working with C programming language. In this tutorial, we will explore what a node is, its purpose, and how it is used in data structures. So let’s dive in!

What is a Node?

A node is a fundamental building block of data structures. It represents an individual element or entity within a data structure. In simple terms, a node contains two main components: data and a reference to the next node.

Components of a Node:

  1. Data:
  2. The data component of a node stores the actual information that the node represents. It can be any type of value such as an integer, character, string, or even another complex data structure.

  3. Reference:
  4. The reference, also known as a pointer or link, points to the location of the next node in the sequence. It establishes the connection between nodes and allows traversing through the data structure.

Why Use Nodes?

Nodes are used to create various types of data structures, such as linked lists, trees, graphs, and more. They help organize and manage data efficiently by establishing relationships between different elements.

Linked List Example:

A commonly used example of nodes is in the implementation of a linked list. In a linked list, each node contains its own data and links to the next node in the sequence.

<!-- Sample C code for creating a linked list -->
struct Node {
    int data;
    struct Node* next;

int main() {
    struct Node* head = NULL;
    struct Node* second = NULL;
    struct Node* third = NULL;

    // Allocate memory for nodes
    head = (struct Node*)malloc(sizeof(struct Node));
    second = (struct Node*)malloc(sizeof(struct Node));
    third = (struct Node*)malloc(sizeof(struct Node));

    // Assign data values and set references
    head->data = 1;
    head->next = second;

    second->data = 2;
    second->next = third;

    third->data = 3;
    third->next = NULL;

    return 0;

In the above example, we create a linked list with three nodes. Each node contains an integer value and a reference to the next node in the sequence. The last node's reference is set to NULL to indicate the end of the list.


In summary, a node in data structure is a fundamental component that holds data and references within various data structures like linked lists, trees, and graphs. Understanding nodes is crucial for implementing efficient algorithms and manipulating data effectively.

By grasping the concept of nodes, you can unlock the power of complex data structures in C programming language and build versatile applications.

Happy learning!