Everyone knows it. There is nothing worse than a not tailored content. Just think how frustrating is surfing a very complex website on the small screen of your cellular phone. You probably waste your time zooming and scrolling the pages, but, anyway, it's clear: if you want a comfortable user experience you need dinamically adaptable contents according to hardware and browser specifications of your device.
That's the reason why Device Description Repositories (DDR) exist. These are databases that store a huge amount of information concerning mobile phones, tablets, Interactive TVs, set top boxes and any device having a Web browser, in order to allow developers to realize applications extremely enjoyable on each client.