HTG Explains: What Is Windows RT and What Does It Mean To Me?
 

Windows RT is a special edition of Windows 8. It runs on ARM and you’ll find it alongside Intel x86 machines in stores, but you’ll be surprised just how much Windows RT differs from the Windows you know.

Windows RT is so different that Microsoft has told Mozilla Windows RT “isn’t Windows anymore.” If you’re looking to buy a Windows system in stores, you should know the difference between Windows RT and the other editions of Windows 8.

http://www.howtogeek.com/116637/htg-...it-mean-to-me/