Today people use many different devices to browse the internet whether for business or pleasure. Responsive web design (RWD) is the process of constructing your website so that no matter what screen size a visitor is using your website will respond and self adjust to fit that screen.
The responsive web design "The Design of Tomorrow" uses current W3C standards, CSS3 media queries with fluid proportion-based grids, to adapt the layout to the viewing environment, and also flexible images that would responsively adjust on-the-fly.
Having responsive web design can help your business adapt to the ever growing market of smart media such as tablets and mobile phones, yet still have a website that also works for regular computers. It is also both cost and time effective as you are building a single website for multiple devices versus designing and developing multiple websites to work for each specific device.