React Native is a popular framework for building cross-platform mobile applications using JavaScript and React. It allows you to write a single codebase that runs on both iOS and Android while leveraging native components for a smooth user experience.

Key Features of React Native:

Cross-platform development: Write once, run on both Android and iOS.

Fast refresh: See code changes instantly without recompiling the app.

Native performance: Uses native components instead of WebViews for better performance.

Reusable components: Build UI elements as reusable components.

Third-party libraries: Supports a vast ecosystem of libraries and tools.

Setting Up React Native

1. Install Node.js and npm (or use yarn).

2. Install Expo CLI (simpler) or React Native CLI (for more control):

Expo: npm install -g expo-cli

React Native CLI: Install dependencies like Android Studio/Xcode, then use:

npx react-native init MyApp

cd MyApp

npx react-native start

3. Run your app:

On a physical device/emulator (Expo): expo start

With React Native CLI:

Android: npx react-native run-android

iOS: npx react-native run-ios (requires macOS)