Components in React JS

 Components in React JS

In React, a component is a reusable piece of UI that can be composed together to create complex UIs. Components can be defined as functions or classes. Here's an example of a functional component:

jsx

function Greeting(props) {

  return <h1>Hello, {props.name}!</h1>;

}

ReactDOM.render(

  <Greeting name="John" />,

  document.getElementById('root')

);

In this example, the Greeting component takes a name prop and displays a greeting message.