MaterialUI

Material-UI, now branded as MUI, is a widely used open-source user interface library for building web applications with React. It implements Google's Material Design guidelines through a wide range of prebuilt components, theming options, and utilities intended to help developers produce consistent, accessible, and responsive user interfaces.

The library is organized into core components, known as MUI Core, and optional extensions called MUI X. MUI Core provides components such as Button, TextField, AppBar, Card, Dialog, Grid, and more. MUI X supplies advanced components such as advanced data grids and charts, which are available under commercial licenses in addition to the free community edition.

Styling and theming are central to MUI. The library uses a CSS-in-JS approach (with emotion as the default styling engine since v5) and offers a robust design system with tokens for palette, typography, shape, and shadows. The sx prop and a theme object (created with createTheme) enable fine-grained customization, while built-in breakpoints support responsive layouts.

Usage and integration: MUI works with React and supports TypeScript. Typical installation includes npm install @mui/material @mui/icons-material @emotion/react @emotion/styled, followed by wrapping your app with a ThemeProvider and optionally CssBaseline.

Branding and ecosystem: The project rebranded from Material-UI to MUI around 2021–2022. It maintains extensive documentation and an active community, with a large ecosystem of related packages, tooling, and examples. The core library is MIT-licensed, while MUI X components carry commercial licensing for some features.

MUI aims to provide a scalable, accessible, and customizable UI foundation for React applications, supported by thorough documentation and a vibrant developer community.