Windows excess RT is that it has the ability to run on ARM-based chipsets commonly used in tablet computers. And the disadvantage is that it can run on ARM-based chipset only (tablet computers). That especially means that RT Windows can not be installed on a machine powered by the x86 and x64
other difference is Windows RT containing Microsoft Office Home and Student 2013 (World, Excel, PowerPoint and OneNote), which means that you do not need to purchase a separate license is required for the Office suite.
Differences Windows 8 and Windows RT
The chart below is provided by Microsoft and allows you to find all the differences that exist between Windows 8 and Windows RT.
|Graphics Differences Windows 8 and Windows RT|