Introduction to Linked List in  Data Structures

Data structures are the backbone of computer science, serving as the fundamental building blocks for organising and managing data efficiently. Among the plethora of data structures, linked lists in data structure stand out as a fundamental and versatile concept. In this tutorial, we will delve into the intricacies of linked lists in the realm of data structures, exploring their functionality, types, and applications.

What is a Linked List?

At its core, a linked list is a linear data structure Tutorial comprising a sequence of elements, known as nodes, where each node holds data and a reference or a pointer to the next node in the sequence. Unlike arrays, which store elements in contiguous memory locations, linked lists utilize pointers to link nodes, offering flexibility in memory allocation.

Anatomy of a Linked List

A linked list consists of nodes, with each node containing data and a pointer to the next node in the sequence. The first node is called the head, serving as the starting point of the list, while the last node’s pointer typically points to null, indicating the list’s termination.

Types of Linked Lists

1. Singly Linked List

In a singly linked list, each node contains data and a pointer to the next node in the sequence. Traversal in a singly linked list occurs in a unidirectional manner, starting from the head and progressing through each subsequent node until reaching the end.

2. Doubly Linked List

A doubly linked list extends the concept of a singly linked list by adding an extra pointer to each node, pointing to the previous node. This bidirectional navigation allows traversal both forward and backward within the list.

3. Circular Linked List

In a circular linked list, the last node’s pointer doesn’t point to null; instead, it connects back to the first node, forming a circular structure. This feature enables continuous traversal through the list without encountering a null pointer.

Operations on Linked Lists

1. Insertion

Insertion at the Beginning

Adding a node at the beginning of a linked list involves creating a new node, assigning the current head as its next node, and updating the head to point to the new node.

Insertion at the End

To append a node at the end of a linked list, traverse through the list until reaching the last node, and then set the last node’s pointer to the new node.

2. Deletion

Deletion of a Node

Removing a node from a linked list requires adjusting the pointers to bypass the node to be deleted and deallocate its memory.

Advantages of Linked Lists

1. Dynamic Size

One of the key advantages of linked lists is their dynamic size. Unlike arrays with fixed sizes, linked lists can dynamically adjust by allocating memory as nodes are added or deallocated when nodes are removed.

2. Efficient Insertions and Deletions

Insertions and deletions in linked lists can be more efficient than arrays since they involve updating pointers without the need for shifting elements.

Applications of Linked Lists

1. Memory Allocation

Linked lists play a crucial role in memory allocation systems, such as dynamic memory allocation, where memory blocks are allocated and deallocated dynamically.

2. Implementation of Other Data Structures

Linked lists serve as the underlying structure for implementing various data structures like stacks, queues, and hash tables due to their flexibility and ease of modification.


In conclusion, understanding linked lists in the realm of data structures is pivotal for any programmer or computer science enthusiast. Their flexibility, efficient operations, and versatile applications make them an invaluable asset in software development and problem-solving. As you delve deeper into the world of data structures, grasp the intricacies of linked lists to broaden your understanding and enhance your programming prowess.

Linked lists in data structures form the bedrock upon which many algorithms and software solutions are built. Embrace their functionality and explore their myriad applications to unlock new possibilities in your programming journey.


Article By – ScholarHat