With Windows 8 comes the introduction of a Metro-style interface, inspired by the lovely and intuitive presentation found in Windows Phone. In it, apps and functions are pinned to tiles and, to interact with those apps, you simply tap those tiles. The former Start Menu has been replaced by a full-screen view of tiles that you can scroll through horizontally. You can pin applications, shortcuts, documents, webpages and any number of other things, customizing the interface in any way you like.
To get a more detailed information, please visit: Windows 8 Consumer Preview