React JSX is the React JavaScript extension, or you can say react JavaScript XML, both are same. So the question is what is React JSX? And why need to know about it?

React’s JavaScript Extension JSX (JavaScript Extension) allows you to write JavaScript code that looks similar to HTML. JSX, an HTML-like syntax that React uses to extend ECMAScript, allows the syntax to co-exist with JavaScript/React. The syntax is preprocessors, i.e., source to source compiler such as babel, to convert HTML-like syntax into a standard JavaScript object that a JavaScript engine can parse.
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