React JS is a JavaScript library, commonly used to develop software that is constantly refreshing data on its UI. This technology eliminates the need of reloading the whole screen and also avoids processing every single line of code. React JS allows you to create components actually made with JavaScript; the famous scripting language used to create interactive applications and interfaces. If you’re using an app that is constantly updating its data, then it is probably developed with JavaScript.

React JS uses a couple of extensions named JSX and Virtual DOM to create user interfaces. These allow developers to create them for most platforms, and thanks to the fact that they can see the results of their code instantly, they can have a better view and understanding of what they’re doing. JSX: You probably know HTML. It is one of the most common languages around since it is easy to learn and use. Due to the manifested acceptance of this technology, it is used in pretty much every website published on the Internet.

React JS makes use of something called JSX. This is an extension of React that allows the use of HTML with JavaScript, and this makes your code more versatile. React is compatible with most modern browsers, which helps developers to change and test their DOM on different platforms.

Virtual DOM: DOM is short for Document Object Model, which is an Application Program Interface (API). It allows programs to read any website’s content so it can be modified according to the coder’s likes and needs. Any website that isn’t using React JS is using HTML to change and modify its DOM.

Thanks to the implementation of JSX is that React JS can have a Virtual DOM, which is a copy of the original DOM used by the app or website. The main difference between the DOM and the Virtual DOM is that the former only shows changes after the page is loaded again, while the latter shows them in real-time without the need of reloading.