diff --git a/README.md b/README.md
index de5efe40..035b68ab 100644
--- a/README.md
+++ b/README.md
@@ -157,6 +157,8 @@ Learn to code and get hired with <a href="https://zerotomastery.io/?utm_source=g
 | 126 | [What are the popular React-specific linters?](#what-are-the-popular-react-specific-linters)                                                                                                                                     |
 | 127 | [How to make AJAX call and In which component lifecycle methods should I make an AJAX call?](#how-to-make-ajax-call-and-in-which-component-lifecycle-methods-should-i-make-an-ajax-call)                                         |
 | 128 | [What are render props?](#what-are-render-props)                                                                                                                                                                                 |
+| 129 | [How ReactJS works behind the scenes?](#how-reactjs-works-behind-the-scenes)
+
 |     | **React Router**                                                                                                                                                                                                                 |
 | 129 | [What is React Router?](#what-is-react-router)                                                                                                                                                                                   |
 | 130 | [How React Router is different from history library?](#how-react-router-is-different-from-history-library)                                                                                                                       |
@@ -3099,6 +3101,10 @@ Learn to code and get hired with <a href="https://zerotomastery.io/?utm_source=g
 
      Libraries such as React Router and DownShift are using this pattern.
 
+129. ### How ReactJS works behind the scenes?
+
+     ReactJS works by creating a virtual representation of the DOM called the `virtual DOM`, which is a lightweight copy of the `Real dom`. When the state of the `UI changes`, React `updates the virtual DOM` and efficiently determines what changes need to be made to the `Real dom` to reflect the `new state`. This allows for fast and efficient updates to the UI `without` requiring a `full reload` of the page.
+
 ## React Router
 
 **[⬆ Back to Top](#table-of-contents)**