What is JSX?

JSX is a syntax notation for JavaScript XML(XML-like syntax extension to ECMAScript). It stands for JavaScript XML. It provides expressiveness of JavaScript along with HTML like template syntax. For example, the below text inside h1 tag return as javascript function to the render function,

   render(){
    	return(
         <div>
            <h1> Welcome to React world!!</h1>
         </div>
    	);
     }