MUI

Mui, commonly written as MUI, is an open-source user interface framework for building web applications with React. It originally launched as Material-UI and implements Google's Material Design system, offering a large collection of reusable, accessible components such as buttons, text fields, dialogs, cards, menus, and navigation elements. The library aims to provide a consistent look and feel across applications while enabling developers to customize appearance through a theming system.

MUI is component-driven and relies on a CSS-in-JS styling approach. It supports theming to align with brand colors, typography, and elevation semantics, and provides responsive layout utilities, grid systems, and a suite of accessibility features. The framework integrates with modern React features, including hooks, and supports server-side rendering and performance optimizations for production applications.

Installation is typically performed via npm or yarn, and the project is distributed under the MIT license. Since its early days, Material-UI expanded beyond Google's Material Design, and around 2021 the project rebranded to MUI to reflect a broader component ecosystem. The MUI team, together with a community of contributors, maintains comprehensive documentation and a growing ecosystem, including MUI X, a set of advanced components such as a data grid, as well as compatibility with popular tooling in the React ecosystem.

MUI has become one of the most widely used UI libraries in the React community by providing a mature, flexible, and well-documented foundation for building consistent, accessible interfaces.