The Significance of Virtual DOM in ReactJs ..!

Before exploring the significance of Virtual DOM we need to get an idea on the concept of DOM and the limitations in traditional DOM manipulation.

What is DOM?

The DOM is a W3C (World Wide Web Consortium) standard

The DOM defines a standard for accessing documents: “The W3C Document Object Model (DOM) is a platform and language-neutral interface that allows programs and scripts to dynamically access and update the content, structure, and style of a document.”

What is HTML DOM?

The HTML DOM is a standard object model and programming interface for HTML.

It defines:

  • The HTML elements as objects
  • The properties of all HTML elements
  • The methods to access all HTML elements
  • The events for all HTML elements

In other words:

The HTML DOM is a standard for how to get, modify, add or delete HTML elements. At the basic level, a website consists of an HTML and CSS document. The browser creates a representation of the document in a tree structure of objects known as Document Object Model(DOM). The document helps JavaScript to directly access and manipulate the content, structure, and styles of the document.


The DOM represents a document with a logical tree structure. Each branch of the tree ends in a node, and each node contains HTML objects. So it is the owner of all other objects in your webpage and If you want to access any HTML object on your webpage you always have to start with the document. DOM properties and methods allow programmatic access to the tree. Nodes have event handlers attached to them, once an event is triggered using JavaScript, the event handlers enable us to access and modify our website.


Taking JavaScript application data and rendering it into a browser is a costly operation. Let’s consider an example, Imagine a complex UI with thousands of DOM nodes. The user inputs a data in a form field and you want to update a <p> tag’s content to reflect this. With Javascript, you have to change all the DOM nodes (remember we have thousands of them) to see the change in just one node. So “DOM manipulation is expensive” in the traditional web world.
To overcome the limitations in traditional DOM the concept of the Virtual DOM came into existence.

What is Virtual DOM?

The virtual DOM is a programming concept where a virtual representation of a User Interface is kept in memory and synced with the Real DOM. In React context, the Virtual DOM is React’s local and simplified copy of the HTML DOM. ReactJS is the first framework to take this to an obvious conclusion: optimizing for DOM manipulation leads to a fast library, and in this case, a library which enables web applications that require very little code. ReactJS works by storing the state of your application internally, and only re-rendering your content into the browser (the DOM manipulation) when the state changes. You interact with ReactJS by telling it when the state has changed and ReactJS handles all the visual changes to your application for you. Consider the above example, React sees the change you want to make and only re-renders the <p> tag. This one behavior leads to massive performance increases and is the reason for React to become more popular.

More Blogs

Demystifying Vector Databases: Unleashing the Power of High-Dimensional Data

A vector data store is a specialized database designed to store high-dimensional embedding representations of diverse data types, including audio, video, images, text, and more. One of its core functionalities is the ability to efficiently search for vectors within the store that closely resemble a given query vector.
Vector stores streamline the process of storing embeddings and conducting similarity searches among these vectors, simplifying the management and retrieval of high-dimensional data representations.

Read more

Enhancing Customer Experience with GenAI Applications

In this blog, we will explore the creation of GenAI applications that significantly enhance the customer experience by leveraging OpenAI’s Large Language Models (LLMs) through their APIs, as well as key AWS services like Amazon Kendra, AWS Transcribe, and AWS Polly. Additionally, we’ll discuss the pivotal role of AWS S3 and In-Memory Cache for storing indexed data, chat history, and serving the GenAI application’s various functions

Read more

Evolution of Application Integration and API First Approach

Over time, the landscape of application integration has undergone significant changes. We’ve moved from integration within Mainframes to traditional file-based communication to more advanced methods.

In the ever-evolving digital landscape, APIs (Application Programming Interfaces) have become a crucial component in various domains, including e-commerce, banking, social platforms, and enterprise applications, enabling seamless communication between software components and services.

Read more
Contact us

Partner with us for Comprehensive IT

We’re happy to answer any questions you may have and help you determine which of our services best fit your needs.

Your benefits:
What happens next?

We Schedule a call at your convenience 


We do a discovery and consulting meeting 


We prepare a proposal 

Schedule Consultation