Windows 8, the newest version of Windows and is an entirely new operating system. It introduces a "tiles" look-and-feel and improves the Windows experience on mobile and touchscreen devices.
It's biggest change to the user-facing portions of Windows since Windows 95. The default interface, previously code-named "Metro" and now designated "Modern" or "Windows 8", is optimized for touch, with large finger-friendly tiles and various swipes to activate and manipulate.
There are two interfaces in Windows 8: the new "Modern" user interface and the classic Windows desktop, familiar to users of Windows 7. The classic desktop itself is merely another tile within the Start screen, and the Start screen (shown to the left) shares only its name with previous Start menus. Signs of this major interface transition pervade Windows 8.
The Start Menu is gone. Instead, front and center are tiles that can dynamically display information or bring you directly to applications, web site, documents and more. The "traditional desktop" is now "behind" the Windows 8 tiled UI. If desired, you can install Classic Shell , a utility that displays a Start menu as in Windows 7.