Introduction to React

React is a free and open-source front-end JavaScript library for building user interfaces based on components. It is maintained by Meta (formerly Facebook) and a community of individual developers and companies.

What makes React special?

React allows developers to create large web applications that can change data, without reloading the page. The main goal of React is to be fast, scalable, and simple. It works only on user interfaces in the application. This corresponds to the View in the MVC (Model-View-Controller) template.

Key Features

• Declarative: React makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes.
• Component-Based: Build encapsulated components that manage their own state, then compose them to make complex UIs.
• Virtual DOM: Instead of manipulating the browser's DOM directly, React creates a virtual copy of it in memory. When state changes, React compares the Virtual DOM with the real DOM and updates only the necessary parts.

Note: React is not a framework like Angular; it is a library focused specifically on the UI layer.