Polymer Starter Kit
developers.google.com/web/tools/polymer-starter-kit/index
The Polymer Starter Kit makes it easy to build a responsive website that follows material design.
Responsive Web Design
Responsive web design is a website suitable to work on every device and every screen size, no matter how large or small, mobile or desktop.
Material Design
Material Design (codenamed Quantum Paper) is a design language developed by Google. Expanding upon the "card" motifs first seen in Google Now, it is a design with increased use of grid-based layouts, responsive animations and transitions, padding, and depth effects such as lighting and shadows.