It is an application that allows you to check the implementation examples and code of the items in the Components list of Google Developer Reference Material Design 3.
Please use the sample code for operation verification.
Check the code with the Android standard HTML viewer.
It's built into the app so you can check it even when you're offline.

Components can also be searched by partial matching of API names such as "Card" and control names such as "Button" using the search function of the application.