Responsive Web Design (RWD) is an approach of laying-out and coding a website such that the website provides an optimal viewing experience — ease of reading and navigation with a minimum of resizing, panning, and scrolling — across a wide range of devices (from desktop computer monitors to mobile phones).
The designer creating a Responsive Design should ensure that the website’s navigation elements, screen-layouts, text, images, audio/video players and other UI elements re-adjust themselves on a variety of devices. Thus, one need not spend extra time and money in creating and maintaining one “mobile-site version” and another “desktop-site version” of her website.
Responsive web design sites are fluid, meaning the content moves freely across all screen resolutions and all devices.
Responsive web design is about providing the optimal user experience irrespective of whether they use a desktop computer, a smartphone, a tablet or a smart-TV.
One website costs less than two, and the savings can be substantial.
Google states that responsive web design is its recommended mobile configuration.