Now that computers have evolved into smaller devices, the web is evolving with them, changing once again the definition of a website. Building a website that works across devices requires that the site's central message is more focused and clear. It should be simple enough to understand and fit on a four inch screen.
The responsive method to website design should not only take into consideration adjusting the layout to look good across mobile devices, but it should work well for each specific device. Just as apps are designed for individual devices, the website should follow similar guidelines in its design's details.