React vs Angular Virtual DOM JSX Rendering Components Features and More
Are you preparing for a React.js or MERN Stack interview in 2025
In this video, I explain the most popular React interview questions asked in fresher, junior, and frontend developer interviews. Each concept is explained in simple language, with examples and clear differences to help you understand React fundamentals deeply.
This video is perfect for beginners, freshers, or anyone who wants to strengthen their core React knowledge.
🌟 Topics Covered in This Video
1 What is React
React is a JavaScript library used for building fast and interactive user interfaces. It follows a component based architecture and is maintained by Meta.
2 What is the Meaning of Virtual DOM
Virtual DOM is an in memory lightweight representation of the real DOM. React updates only the necessary parts of the UI by comparing the current virtual DOM with the previous one.
3 Important Features of React
Component based architecture
Virtual DOM
Reusable UI components
Unidirectional data flow
High performance
Large ecosystem and community support
4 What is JSX
JSX stands for JavaScript XML. It allows writing HTML like code inside JavaScript and makes UI building easier and more readable.
5 Can Browser Read a JSX File
No. Browsers cannot understand JSX directly. It must be compiled into plain JavaScript using tools like Babel through Create React App or bundlers.
6 Why React Is Widely Used Today
Easy to learn
Fast rendering
Reusable components
Massive community support
Used in many production level apps
Rich ecosystem with libraries like Redux React Query Router etc.
7 Disadvantages of React
Fast updates can confuse beginners
JSX learning curve
Poor documentation sometimes
Requires additional libraries for routing and state management
8 Difference Between Angular and React
Angular is a full framework while React is a UI library.
Angular uses TypeScript heavily React uses JavaScript with optional TS.
Angular uses real DOM React uses virtual DOM.
Angular follows two way binding React follows one way data flow.
Angular has built in features React needs external libraries.
9 What is Component Based Architecture in React
React applications are built using independent reusable components. Each component handles its own logic and UI, making apps easier to maintain, test, and scale.
10 Difference Between Render and Return in React
render method describes what should appear on the screen.
return statement is used inside the component to output JSX.
render is a lifecycle method in class components whereas return is used inside function components.
11 How Rendering Works in React
Whenever state or props change, React creates a new virtual DOM.
React compares it with the old virtual DOM.
Only the changed elements are updated in the real DOM.
This process improves performance and prevents full page reloads.
📝 Notes for Viewers (Perfect for Revision)
Quick Notes
React is a JavaScript library for building user interfaces.
Virtual DOM makes UI updates faster and more efficient.
JSX is a syntax extension that looks like HTML but compiles to JavaScript.
Browsers cannot read JSX directly, it must be compiled.
React is widely used because it is fast, scalable, and has strong community support.
React components promote reusability and clean architecture.
Key Differences
Angular vs React
Angular is a complete framework
React is a library
React uses virtual DOM
Angular uses real DOM
Render vs Return
Render describes what should be drawn
Return gives the JSX to display
Rendering Flow in React
State or props update
React builds a new virtual DOM
Compares with old virtual DOM
Updates only the changed parts in real DOM
React interview questions 2025
What is React
React virtual DOM explanation
JSX explained for beginners
React features overview
React vs Angular difference
React rendering process
Component based architecture React
React fresher interview preparation
Frontend developer interview questions
MERN stack interview questions
React JSX browser support
React tutorial for beginners
React rendering deep explanation
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