Windows 8 introduces a new "Modern" or "Start Screen" interface that allows running both traditional desktop programs and new "tablet-style" apps. It syncs data and settings across devices using an integrated cloud. While the traditional desktop is still available, the new interface aims to provide a consistent experience across PCs, laptops, and mobile devices as part of Microsoft's convergence strategy. The document provides tips for upgrading or doing a clean install of Windows 8 and adjusting settings to improve usability.