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React Native

React Native is a framework developed by Facebook that allows developers to create mobile applications using JavaScript and React. It uses the same design as React, letting developers utilize declarative components for building blocks, but instead of targeting the browser, it targets mobile platforms.

This means that instead of creating iOS or Android apps using their respective programming languages (Swift for iOS and Java or Kotlin for Android), developers can write code in JavaScript and React and the framework will render native components. This can result in a significant time saving, as developers can use the same code for deploying on both iOS and Android platforms.

Moreover, not only can developers build mobile apps that have the look and feel of a native application, but they can also use the same fundamental UI building blocks as regular Android and iOS apps. Hence, React Native allows an app to have the speed and performance of a native mobile application, as well as the convenience and efficiency of development in JavaScript and React.

Here's a simple example of React Native code:

```
import React from 'react';
import { Text, View } from 'react-native';

const HelloWorldApp = () => {
return (
<View
style={{
flex: 1,
justifyContent: 'center',
alignItems: 'center'
}}>
<Text>Hello, world!</Text>
</View>
)
}
export default HelloWorldApp;
```

In this snippet, we first import the necessary modules (React and two components from React Native). Then, we declare a new React component, 'HelloWorldApp'. In the return of this component, we layout our UI within a 'View' component and then place a 'Text' component within it to display the message "Hello, world!".

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