Responsive Website Design is the latest buzzword in the web design industry at the moment. With so many people accessing the internet on tablets and mobile phones, it's important that your website displays correctly on these devices as well as on desktop and laptop screens.
Responsive Design means that the website using the latest CSS3 techniques to allow the design to be flexible and responsive to fit the device on which it's being viewed, without having to maintain several versions of each website.
Until recently, if you wanted your website to appear nicely on a mobile phone, you needed a separate mobile website. This caused many issues and made it hard to keep both sites up to date and in sync. Now with responsive techniques, you just need to worry about the content text and images and let our system worry about how this is displayed to the user.
If you want to see an example of a responsive website then you don't need to go far. Just resize your browser screen or veiw this website on a mobile phone and hey preseto, you're looking at how a website responds to the viewing device.
As well as my own experience and knowledge, I take a lot of advice from the author of a great book called Repsonsive Web Design from A Book Apart.