This document discusses responsive web design and atomic design. It notes that responsive design uses fluid grids, flexible images and media queries to provide a continuous experience across devices. Atomic design is introduced as a methodology that breaks interfaces into basic building blocks called atoms, and then combines them into larger components called molecules and organisms. Defining appropriate breakpoints is also discussed as key to responsive design. The document encourages responsive design as it allows for single development and maintenance while adapting content for different screens.