Responsive web design is a style of web development where both the layout and the content responds to the device on which it is being rendered and the size of the screen it is presented on. If you're viewing this article on a desktop browser, for example, try making your browser window smaller. The content column will shrink and the placement of the text will adjust. On our homepage, you'll see the image sizes adjust and the layout shrink from three columns, to two columns, to a singular column of content.
WHY IS RESPONSIVE DESIGN IMPORTANT?
Responsive web design is not only about adjustable screens and automatically resizable images, but rather about a whole new approach to web design. Given the rapid adoption of tablets and smartphones, web designers and developers want to eliminate the need for a different design and development phase for each new device. The solution is to build one site that has the ability to adapt to all devices.