Responsive Web Design
One of the big buzz words in Web Design right now if Responsive Web Design. And rightly so. Responsive Web Design involves creating pages that adjust (or "respond") to the screen size on which they are viewed. Whether a wide screen monitor, a netbook, a tablet or a smartphone, the layout will adjust to the size. The website you're currently viewing is a Responsive Website.
Mobile Friendly Web Design
Responsive Web Design provides an excellent foundation for mobile friendly web design. More and more people are viewing the internet with smart phones or tablets. With a Responsive Website, you know your site will appear properly on mobile devices. The layout will adjust to the size and resolution of the mobile device
Why Responsive Design is Important
In the past, the vast majority of people viewed websites on a desktop or laptop computer. Over time, more and more people view websites on a wide array of devices. And the displays on those devices vary greatly. With responsive design, the website will adjust to each device. It's a way of producing one website that is universal.
Search Engine Optimization
According to Google, "Google recommends webmasters follow the industry best practice of using responsive web design, namely serving the same HTML for all devices and using only CSS media queries to decide the rendering on each device." By following Google's design recommendations, you will boost search engine optimization for your website.
Beat your Competition
At the time of this writing, only 2% of websites use responsive design. By having a responsive site, you'll have a distinct advantage over your competition.
Google recommends responsive design: (https://developers.google.com/webmasters/smartphone-sites/)