A Responsive website “responds” in size and format to the device that it is being viewed on.

It shrinks if you are looking at it on a smart phone and expands when viewing on a large computer monitor.

Millions of people are now playing with devices that can be held in 2 ways, portrait and landscape and content and images on the website need to shift, to accommodate both orientations.

Responsive Web Design is achieved by adapting the content, design, navigation and method of interaction to deliver the same comfort and usability to the mobile user as to the desktop user.