What Is Linked List in Data Structure W3schools?


Larry Thompson

Linked List in Data Structure – A Comprehensive Guide

In the world of data structures, the linked list is a fundamental concept that every programmer should be familiar with. It provides a flexible way to store and organize data, allowing for efficient insertions and deletions. In this tutorial, we will explore what a linked list is and how it works.

What is a Linked List?

A linked list is a linear data structure that consists of nodes connected together. Each node contains data and a reference (or link) to the next node in the sequence. Unlike an array, which stores elements in contiguous memory locations, a linked list can dynamically allocate memory for each node, making it more flexible.

Let’s take a look at an example to understand how a linked list works:

Node 1

  • Data: 10
  • Next: Node 2

Node 2

  • Data: 20
  • Next: Node 3

Node 3

  • Data: 30
  • Next: Null

In this example, we have three nodes connected together. Each node stores its own data value and has a reference to the next node in the sequence. The last node has a reference value of null since there are no further nodes.

Main Components of a Linked List:

Node: A node is an elementary unit of a linked list that contains data and a link/reference to the next node.

Data: Data refers to the information stored within each node. It can be any type of value, such as an integer, string, or even a complex object.

Next: The next field of a node points to the next node in the sequence. It is crucial for traversing and accessing elements in the linked list.

Types of Linked Lists:

There are various types of linked lists, each with its own characteristics. Here are a few commonly used ones:

Singly Linked List:

In a singly linked list, each node has a reference to the next node in the sequence. It allows traversal only in one direction – from the head (first node) to the tail (last node).

Doubly Linked List:

In a doubly linked list, each node contains references to both the next and previous nodes. This allows for traversal in both directions – forward and backward.

Circular Linked List:

A circular linked list is similar to a singly linked list, except that the last node points back to the first node instead of having a null reference. This creates a circular structure.

Advantages of Linked Lists:

  • Dynamic Size: Unlike arrays, linked lists can grow or shrink dynamically by adding or removing nodes.
  • Efficient Insertions/Deletions: Inserting or deleting elements in a linked list is more efficient compared to arrays since it involves updating just a few references.
  • Flexibility: Linked lists can store elements with different sizes and structures.

Disadvantages of Linked Lists:

  • Inefficient Random Access: Unlike arrays, accessing an element at a specific index in a linked list requires traversing through all preceding nodes.
  • Extra Memory: Each node in a linked list requires additional memory to store the data and reference fields.
  • Complexity: Linked lists can be more complex to implement and manipulate compared to arrays.


In summary, a linked list is a versatile data structure that offers flexibility and efficiency for managing data. It consists of nodes connected together, with each node storing data and a reference to the next node. By understanding the main components and types of linked lists, you can leverage this powerful data structure in your programming journey.

Remember to explore further resources and practice implementing linked lists to solidify your understanding. Happy coding!

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