DEFINITION: Responsive Web Design (RWD)

Responsive web design (RWD) is an approach to web design aimed at crafting sites to provide an optimal viewing and interaction experience—easy reading and navigation with a minimum of resizing, panning, and scrolling—across a wide range of devices (from desktop computer monitors to mobile phones).

-WikiPedia

My website portfolio contains several examples of RWD sites.  Just look for the “Responsive Layout” tag under the portfolio thumbnail.