when to use render in react code example

Example 1: how to render in react

const element = <h1>Hello, world</h1>;
ReactDOM.render(element, document.getElementById('root'));

Example 2: render props

//Render props are functions that are passed to props as values
const User = (props) => {
	const [name, setName] = useState('John')

	//we pass values to prop-function as args
	return <div>{props.render(name)}</div>
}

//Then we can use this component like this:
<div>
  //when using the component we receive the passed values (name) as args here 
  <User render={(name) => <div>{name}</div>} /> 
</div>

Example 3: ReactDOM.render()

ReactDOM.render(element, container[, callback])