What does Responsive mean in the world of web and should I upgrade my website?
"In simple terms, a responsive web design uses "media queries" to figure out what resolution of device it's being served on."
Flexible images and fluid grids then size correctly to fit the screen. If you're viewing this article on a desktop browser, for example, try making your browser window smaller. The images and content column will shrink, then the sidebar will disappear altogether. On our homepage, you'll see the layout shrink from three columns, to two columns, to a singular column of content.
The benefits are obvious: You build a website once, and it works seamlessly across thousands of different screens.
Given the rapid adoption of tablets and smartphones — and the fact that users currently seem to prefer reading their news on the mobile web rather than in apps — I think it's inevitable that 2013 will be the year that responsive design takes off.