JSX is a syntax extension for JavaScript that allows you to write HTML-like code in your JavaScript files. It was introduced by Facebook as part of their React framework. JSX helps you to build user interfaces by combining the power of JavaScript and HTML.In JSX, you can write HTML elements directly in your JavaScript code. These elements are called "JSX elements". They look similar to normal HTML tags, but they are actually function calls that create and return React virtual DOM elements. JSX also allows you to embed JavaScript expressions inside curly braces within the HTML-like syntax.Here's an example of JSX code:```jsxconst element =

Hello, World!

` element is a JSX element that will be transformed into a virtual DOM element by React. It can then be rendered and displayed on the web page.JSX also supports embedding JavaScript expressions and variables within curly braces. For example:```jsxconst name = "John";const greeting =

Hello, {name}!

;```Here, the value of the `name` variable is inserted dynamically into the JSX element using curly braces.JSX provides a more concise and familiar way to write UI components compared to pure JavaScript or string concatenation. It allows developers to describe complex user interfaces in a declarative manner while leveraging the full power of JavaScript.However, it's important to note that browsers do not understand JSX directly. Therefore, JSX needs to be transformed into plain JavaScript using tools like Babel before it can be executed in a browser environment.

The main products of JSX are programming tools and frameworks for building user interfaces in JavaScript.