Difference Between Windows 8 and Windows 8.1

Parameter	Windows 8	Windows 8.1
Definition	It is a Personal Computer Operating System Designed by Microsoft and is preceded by Windows 7 Operating System.	It is enhanced version of windows 8 operating system.
Start Button	Start Button is not Present in Windows 8.	Start Button is restored to task bar in Windows 8.1 to open start screen.
App  Snapping	Only two app can be snapped onto a single display.	4 Applications can be snapped onto a single display depending upon screen size.
Message App	Message App is available in Windows 8.	Message is Replaced by Skype, which allows users to accept calls directly from lock screen.
Text/GUI Scaling	Windows 8 can scale text and GUI elements up to 150 %.	Windows 8.1 can scale text and GUI elements up to 200%.
Adoption Rate	Current Adoption rate for Windows 8 is 6.41%.	Current Adoption Rate for Windows 8.1 is 4.89 %.
3D Printing	3D Printing Apps is not present in Windows 8.	Windows 8.1 adds support for 3D Printing.
Hardware Compatibility	64 Bit version of windows 8 supports all 64 bit processors.	64 Bit versions of Windows 8.1 do not support s processors which do not implement the double width compare and exchange CPU Instructions.
Personalization options	Personalization options could be found under PC Settings but it allowed less colors and less control.	Windows 8.1 also adds quite a few new personalization options. It not only gives more options, it does it from within the Start Screen.
Sky Drive	In Windows 8 SkyDrive app was limited and was able to read files only.	In windows 8.1 sky drive is much more powerful. It can read/write, and even has automatic photo and video backup options.