Microsoft Recently launched Windows 8 which Microsoft has been reimagined from the Chipset to the user experience. Windows 8 is the biggest Change since Windows 95. This new OS introduces a completely new Experience with its Modern UI
Windows 8 can run on Desktops, Laptops, Netbooks and now ARM powered tablets with a separate OS called Windows RT which is made for tablets running ARM processors. Windows RT can run Windows Store Programs but not x86 programs but Microsoft has bundled Office 2013 with every Windows RT Tablet.
When you power your Windows 8 PC or tablet you will notice the super fast startup which in some cases some Windows 8 devices startup in 5 to 10 seconds after pressing the Power Button and resume in under 5 seconds
After the PC has booted your welcomed by a new lock screen which tells you the time, Date and other stuff and you can customize the lock screen to what ever Picture you want 
The Desktop is still here which hasn’t changed much since Windows 7 but the Aero theme has been replaced with a much basic Metro theme and the Windows Explorer now known as File Explorer has a Ribbon interface which was introduced with Office 2007. 
Windows 8 has Built in Apps which are People, Messaging, Music, Video, Maps and Games. There is also a new Modern Style Internet Explorer.
Overall Windows 8 is a love it or hate it OS. Microsoft has Chosen to use 2 experiences in one OS
