What are the key features of React?

React is a popular JavaScript library for building user interfaces, and it has several key features that make it a powerful tool for developers. Here are some of the main features of React:

1. Components

React introduces a concept called components, which are reusable pieces of code that represent a UI element. Components can contain other components, making it easy to build complex interfaces.

2. JSX

JSX is a syntax extension for JavaScript that allows you to write HTML-like code in your JavaScript files. This makes it easy to create React components and bind data to them.

3. Virtual DOM

React uses a virtual DOM (a lightweight in-memory representation of the real DOM) to optimize rendering. When the state of the application changes, React updates the virtual DOM, and then efficiently updates the real DOM by comparing the two and only making the necessary changes.

4. State and Props

React components have two types of data: state and props. State is used to store data that changes over time, while props are immutable and are passed from a parent component to a child component.

5. Lifecycle Methods

React components have lifecycle methods that are called at different points during the component’s life cycle, such as when the component is mounted or unmounted.

6. Event Handling

React provides an event handling system that allows you to handle events in a declarative way.

7. Hooks

React Hooks are a way to use state and other React features in functional components. They were introduced in React 16.8 as a way to make functional components more powerful.

8. Server-Side Rendering

React can be used for server-side rendering, which allows you to render React components on the server and send the rendered HTML to the client.

9. Declarative Programming Style

React encourages a declarative programming style, which means you describe what you want to see in the UI, rather than how to achieve it.

10. Large Community and Ecosystem

React has a large and active community, which means there are many resources available for learning and troubleshooting.

import React from 'react';

function ComponentName(props) {
  return 
Hello World!
;
}