This video explains how responsive web design works as well as why you should be investing in a responsive design for your site!
Don Hileman's insight:
In the past, if a business wanted a "mobile" friendly website, they would opt for creating a completely separate, "mobile" ready website. When a user would go to their web address on a mobile device, the mobile version of the site would display. This often meant double the work for the website content manager. Today, there is a better option and it is called Responsive Web Design.
It's hard to believe, but Responsive Web Design has been around for nearly a decade. Responsive Web Design allows businesses to maintain a single website while offering a unique experience for mobile users. Responsive websites adapt to the smaller screen size of a phone and make their experience viewing your website more enjoyable.