Material Design (codenamed Quantum Paper) is a design language that Google developed in 2014. Expanding on the "card" motifs that debuted in Google Now, Material Design uses more grid-based layouts, responsive animations and transitions, padding, and depth effects such as lighting and shadows.
Google announced Material Design on June 25, 2014, at the 2014 Google I/O conference.
Designer Matías Duarte explained that, "unlike real paper, our digital material can expand and reform intelligently. Material has physical surfaces and edges. Seams and shadows provide meaning about what you can touch." Google states that their new design language is based on paper and ink but implementation takes place in an advanced manner.
Material Design can be used in all supported versions of Android, or in API Level 21 (Android 5.0) and newer (or for older via the v7 appcompat library), which is used on virtually all Android devices manufactured after 2009. Material Design will gradually be extended throughout Google's array of web and mobile products, providing a consistent experience across all platforms and applications. Google has also released application programming interfaces (APIs) for third-party developers to incorporate the design language into their applications. The main purpose of material design is creation of new visual language that combines principles of good design with technical and scientific innovation.
As of 2015Gmail, YouTube, Google Drive, Google Docs, Sheets and Slides, Google Maps, Inbox, Google+, all of the Google Play-branded applications, and to a whole extent the Chrome browser and Google Keep. The desktop web-interfaces of Google Drive, Docs, Sheets, Slides and Inbox have incorporated it as well. More recently, it has started to appear in Chrome OS, such as in the system settings, file manager, and calculator apps., most of Google's mobile applications for Android had applied the new design language, including
The canonical implementation of Material Design for web application user interfaces is called Polymer. It consists of the Polymer library, a shim that provides a Web Components API for browsers that do not implement the standard natively, and an elements catalog, including the "paper elements collection" that features visual elements of the Material Design.
In 2018, the interfaces of some Google products like Gmail, Google News, Google Pay, and Google Home were redesigned into a customized and adapted version of Material Design, dubbed "Google Material Theme". 
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