React is a JavaScript library for building user interfaces. It was developed by Facebook, and is often used for building single-page applications and mobile applications.
There are a few key reasons why you might want to use React:
Reusable Components: React allows you to build reusable UI components, which can make it easier to build and maintain your application.
Virtual DOM: React uses a virtual DOM (a lightweight in-memory representation of the actual DOM) to optimize updates to the actual DOM. This can make it faster to update the UI, because it minimizes the number of DOM operations that need to be performed.
Declarative: React allows you to write code that is declarative, meaning that you describe what the UI should look like, and React takes care of updating the DOM to match your description. This can make it easier to understand and reason about your code.
Reactive: React's declarative nature makes it easy to build reactive user interfaces. When the state of your application changes, React can automatically update the UI to reflect those changes.
Overall, React is a powerful tool for building modern, interactive user interfaces, and is widely used in the industry today.