What is React JS? It is an open-source front-end JavaScript library that allows developers to create UI components based on the component model. It is maintained by a community of developers and companies, known as Meta. It has been around since 2009, and has been used by several major companies and developers. Let’s examine the basics of the library. And then learn how to use it to create beautiful and functional apps.

What is a DOM? A DOM is a representation of HTML or XML code in the form of trees. Web browsers use a DOM-like model to render their output. Every object is a node in a DOM tree, which changes when a value or change is made. ReactJS uses a technique called Virtual DOMs to maintain cache memory and pinpoint components that need to be updated.

React uses a virtual DOM (virtual DOM) that is a JavaScript-based representation of the DOM. This virtual representation of the DOM is a tree data structure of plain JavaScript objects. This is stored in memory, and rendering the resulting UI is faster. Because it is only stored in memory, it is automatically updated whenever the state of the application changes. For a fast-loading application, you need to be able to handle multiple simultaneous requests at once.