Expo is a powerful framework and platform for building universal React applications. It allows developers to create cross-platform apps efficiently with a single codebase, meaning your app can run on both iOS and Android without extra configuration. Expo provides access to native device features such as the camera, location services, and push notifications. It also comes with a rich library of prebuilt UI components and tools that speed up development.

With Expo, you can focus on building user experiences rather than spending time on native setup. It’s beginner-friendly but also robust enough for experienced developers. Whether you are prototyping an app or deploying a production-ready project, Expo simplifies the process and helps you ship apps faster.

Example Code (React Native + Expo):

import React from 'react';

import { View, Text, Button, Alert } from 'react-native';

import { Camera } from 'expo-camera';



export default function App() {

  const [hasPermission, setHasPermission] = React.useState(null);



  React.useEffect(() => {

    (async () => {

      const { status } = await Camera.requestPermissionsAsync();

      setHasPermission(status === 'granted');

    })();

  }, []);



  return (

    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>

      <Text>Welcome to Expo App!</Text>

      <Button title="Click me" onPress={() => Alert.alert('Button pressed!')} />

      {hasPermission ? <Text>Camera access granted</Text> : <Text>No camera access</Text>}

    </View>

  );

}

Key Features of Expo:

• Cross-platform development with one codebase

• Access to native device features (Camera, Location, Notifications, etc.)

• Prebuilt UI components (Buttons, Cards, Lists, etc.)

• Over-the-air updates and easy app deployment