Responsive web design (RWD) is not a new concept, but it is finally receiving the attention it deserves due to the increasing number of handheld devices in use today. With the many different display sizes in use today, every website needs to cater to each specific device, in order to optimize the user experience.
Responsive Web Design (RWD) is the more sensible solution, when compared to its predecessor, and has displaced graceful degradation as the preferred design methodology for serving usable web pages to various size displays.