This document discusses the need for multi-device websites that are responsive to different devices. It notes that over 35% of internet traffic now comes from mobile devices and that mobile data usage is growing rapidly. Responsive design allows a website to automatically adapt to different screen sizes so that users have an optimal experience across devices. The benefits of responsive multi-device websites include improved search engine optimization, future-proofing against new devices, focusing on content over device specifics, cost-effectiveness, and performance.