Material Design 3 is the sophisticated underlying design scheme / language / science that underlies Google’s massive presence on the web. It deals with typefaces, colour schemes, icons, accessibility, navigation and more, and has a very large number of moving parts, including an interesting new colour model.
“Material is an adaptable system of guidelines, components, and tools that support the best practices of user interface design. Backed by open-source code, Material streamlines collaboration between designers and developers, and helps teams quickly build beautiful products.”