A framework that contains ready-made elements of the user interface in the form of components for React, visually based on the Material Design pattern. It has basic elements of the layout such as: grids or containers. Form elements, i.e. fields for entering data of various types. And also many other elements: modal windows, buttons, navigation elements, responsive tables and many more. Each of the elements has a lot of configuration options and appropriate API, e.g. validation for a given form field or auto-completion in the search field. It offers much more than Bootstrap or similar frameworks for building websites with built-in elements.

Material UI Homepage