Responsive Web Design (RWD) is an approach to web design that creates an optimal viewing experience across a wide range of devices. Now more than ever, your website needs to be accessible across a growing spectrum of devices from touch phones to desktop computers. Responsive Web Design uses CSS3 media queries, fluid grid-based layouts and flexible text and images to detect the device resolution and automatically resize your website content to suit the device. The benefits of Responsive Web Design are obvious. You build a website once, and it works seamlessly across thousands of different screens and devices.