ReactJS is the most used library for Modern Web development. It was created by Meta (Facebook) and is used by top product companies around the world. The current version of ReactJS is React 19.
The popular development stack MERN, also uses ReactJS for frontend development. In MERN, the 'R' stands for ReactJS.
In ReactJS, the user interface is divided into components. Each component is nothing but a JavaScript function that returns JSX code.
JSX stands for JavaScript XML, it's used to create the User interface with HTML-like syntax.
