Responsive Design aims to produce the optimal user experience for different use cases and environments, all built into one website.
The new models of mobile devices appear very quickly and mobile platforms including their web-browsers are also constantly changing and evolving. Embedding web-browsers into the new devices is now more and more a common practice. It looks like the tablet devices and mobile phones will become even more widespread in the near future and they will be further and more frequently used for accessing the Internet in comparison with desktop computers.
Earlier, the solution of choice for making your web-site compliant with mobile devices and their screen resolutions, no matter whether it could be the tablet device or a simple phone, was to create a special "mobile" version of the site that targeted the specific platform and screen size, which didn't support scaling and required additional expences for development and support. But the today's reality is not limited to just desktops and phones. A user connects to an Internet from an electronic book, navigator in his car, home theater or even the screen of the runtrack in the gym. And it is not so easy to foresee which kind of devices we'll be using for browsing Internet in the future.
The main goal of the adaptive design is to retain the versatility and comfort of the site on wide variety of devices that are used today. There is no need anymore to create a special version of the site just to make it viewable on the different devices under various screen resolutions and operating systems. The site which supports an adaptive design technology easily fits into the screen resolution of any mobile device independently of its platform and screen size.