Now, any tree must have a root node, right? Here, the root node is document. This means that the DOM enables JavaScript to access and modify the web page easily. With JavaScript, we can access any of these nodes (HTML elements) and update their styles, attributes, and so on. Any piece of HTML that we write is added as a node, to this tree. The DOM (Document Object Model) represents the web page as a tree structure. Before moving on and learning more about these features, we must clearly understand the browser DOM. Of course there is more to React than this, but we'll focus on these two features here. So what makes React so popular rather than just using vanilla HTML, CSS, and JavaScript? For that, let's first look at the 2 main features of React:

Now, the common question that comes to everyone's mind is do we really need a JavaScript library, just for creating user interfaces? We can do the same using just HTML and CSS, right?

It was created by Facebook back in 2013.ĭemand for React developers is skyrocketing, which means that having knowledge of this library is definitely going to be worth it! Some of the popular websites built using ReactJS include Dropbox, Netflix, and Instacart – and the list goes on. React.js is an open source JavaScript library for creating user interfaces.

Reactjs what is