what is react? When we use react? Why we use react? How we use react?

What is react?

• React is a JavaScript library used for building user interfaces UIs.
• Created by Facebook (Meta)
• It helps developers build single-page applications (SPAs) where the page updates dynamically without refreshing

When react use?

• Dynamic web apps like dashboards, social media, e-commerce.
• Single Page Applications (SPAs) where only parts of the page update.
• Reusable UI components like buttons, forms, cards that can be used again.

Why use React?

• Fast Uses Virtual DOM for quick updates.
• Reusable Build components once, reuse everywhere.
• Popular & Supported Huge community, lots of libraries.
• Easy to scale Good for small projects and big apps.
• Cross-platform React for web, React Native for mobile apps.

How is React used?

Steps to use React in a project:

• Install Node.js → needed for React.
• Create a React app (using Vite or Create React App).

 npm create vite@latest my-app
 cd my-app
 npm install
 npm run dev

How to write components using JSX.

function App() {
  return <h1>Hello React!</h1>;
}
export default App;

• Run the app in the browser and React renders components dynamically