What is React?

🚀 What is React?

React is a JavaScript library made by Facebook (now Meta). It helps developers build fast and interactive user interfaces for web applications.

⚡ Why React?

• Component Based → UI ko chhote parts me tod sakte ho (button, navbar, card, etc.)
• Reusable Code → Ek component ko baar-baar use kar sakte ho.
• Fast Rendering → React Virtual DOM use karta hai, jo real DOM se fast hai.
• Strong Community → Bahut saare developers aur libraries available hai.

🛠️ Main Features

1. JSX → JavaScript + HTML ek saath likhne ka feature.
2. Virtual DOM → Performance boost deta hai.
3. Hooks → Jaise useState, useEffect state aur lifecycle handle karne ke liye.
4. Single Page Applications (SPA) → Page reload ke bina fast navigation.

👨‍💻 Example Code

import React, { useState } from "react";

function App() { const [count, setCount] = useState(0);

return (

<div>

<h1>Hello React 👋</h1>

<p>Clicked {count} times</p>

<button onClick={() => setCount(count + 1)}>Click Me</button>

</div>

);

}

export default App;

🎯 Conclusion

React is one of the most popular libraries for frontend development. Agar tum web developer banna chahte ho, to React seekhna best choice hai.