<p>React is a UI library developed at Facebook to facilitate the creation of interactive, stateful & reusable UI components. It is used at Facebook in production, and Instagram.com is written entirely in React.</p>
<p><strong>A Simple Component</strong></p>
<p>React components implement a render() method that takes input data and returns what to display. This example uses an XML-like syntax called JSX. Input data that is passed into the component can be accessed by render() via this.props.</p>
<p>Reat components two think props and state. A component takes input data (accessed via this.props), a component can maintain internal state data (accessed via this.state)</p>
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