React JS

ReactJS is a JavaScript library for creating reusable UI components that are declarative, quick, and versatile. It's a component-based, open-source front end library that exclusively handles the application's view layer. Jordan Walke, a software engineer at Facebook, was the one who came up with the idea.

It was created and maintained by Facebook at first, and it was eventually integrated into major products such as WhatsApp and Instagram. ReactJS was first developed in 2011 for Facebook's newsfeed section, but it was first made public in May 2013.

The MVC (model view controller) design is now used by the majority of websites. React is the 'V' in MVC architecture, which stands for view, whereas Redux or Flux provides the architecture

A ReactJS application consists of several components, each of which is responsible for producing a short, reusable piece of HTML code. All React apps are built around components. These components can be stacked with one other to create sophisticated applications from simple building blocks.

To populate data in the HTML DOM, ReactJS uses a virtual DOM-based technique. The virtual DOM is quick because it simply modifies individual DOM elements rather than reloading the entire DOM every time.