Responsive web design (RWD) is a web design approach aimed at crafting sites to provide an optimal viewing experience—easy reading and navigation with a minimum of resizing, panning, and scrolling—across a wide range of devices (from mobile phones to desktop computer monitors).
Responsive design is more than an “add on” that can be plugged-in to a traditional website. Instead, it’s a way of coding your site from the ground up so that it’s easy-to-navigate and user-friendly regardless of the device your prospects are using to browse your site.