These days everybody's got a smartphone, a tablet, and iPod, and a computer and all of these devices can access websites. To keep your website relevant you need it to work regardless of what size screen you're using. That's why Rocket City Webz uses Responsive Web Design (RWD) techniques on every website.
RWD websites are built using a grid system and depending on the size of your screen the appropriate number of grid sections are displayed going across your screen. For your desktop computer there may be 12 grid sections going across a page, but on your smartphone there will only be 1-2. Using this technique you can create a pleasing web experience on every kind of device.