Responsive Web design is an approach whereby a designer creates a Web page that “responds to” or resizes itself depending on the type of device it is being seen through. That could be an oversized desktop computer monitor, a laptop, a 10-inch tablet, a 7-inch tablet, or a 4-inch smartphone screen.
Responsive Web design has become one of the hottest trends in 2013. This is due in part to the growth of smartphones and other mobile devices. More people are using smaller-screen devices to view Web pages.