Last Updated: 4/27/2026

Introduction to React

React is a popular JavaScript library for building user interfaces, particularly single-page applications. Developed and maintained by Meta (formerly Facebook), React has become one of the most widely-used frontend frameworks in modern web development.

Key Features

Component-Based Architecture

React applications are built using reusable components. Each component manages its own state and can be composed together to create complex UIs.

Virtual DOM

React uses a virtual DOM to optimize rendering performance. Instead of updating the entire page, React efficiently updates only the parts of the DOM that have changed.

Declarative Syntax

React uses a declarative approach, making it easier to understand and debug your code. You describe what the UI should look like, and React handles the updates.

Getting Started

To create a new React application, you can use Create React App:

npx create-react-app my-app
cd my-app
npm start

This sets up a modern React development environment with no configuration required.