What is ReactJS? Is it JavaScript or JSX?
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ReactJS, commonly referred to as React, is an open-source JavaScript library for building user interfaces. It is primarily JavaScript-based but incorporates JSX (JavaScript XML) as a syntax extension. React was developed by Facebook and is widely used for creating dynamic and interactive web applications.

Here's a breakdown of React's components:

1. JavaScript: React is fundamentally a JavaScript library. It allows you to define and manage the structure and behavior of your user interfaces using JavaScript. You write JavaScript code to create and manipulate components, handle user interactions, manage state, and more.

2. JSX (JavaScript XML): JSX is a syntax extension for JavaScript often associated with React. JSX allows you to write HTML-like code within your JavaScript files. While it looks similar to HTML, JSX is transpiled (converted) into regular JavaScript code before it's executed by the browser. JSX makes it easier to define the structure of your user interface components in a more declarative and component-based manner.

Here's an example of JSX in a React component:

import React from 'react';

function MyComponent() {
  return (
    <div>
      <h1>Hello, React!</h1>
      <p>This is a JSX component.</p>
    </div>
  );
}

export default MyComponent;

In the code above, the `return` statement inside the `MyComponent` function contains JSX, which defines the structure of the component.

So, in summary, React is a JavaScript library, but it uses JSX as a convenient and expressive way to define the structure of user interface components. JSX is transpiled into JavaScript, which the browser can understand and render as HTML elements.