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1. IMPORTANT OPERATING SYSTEM

2. macOS
AppleInc.UsedinAppleMacintoshDesktops 2001

3. iOS
AppleInc.UsediniPhone, iPodTouch,iPad 2007

4. Lisa OS
AppleInc.UsedinAppleLisa1983

5. Chrome OS
GoogleUsedinLaptopsespeciallyinChromebook2011

6. Android
GoogleUsedinSmartphones, Tablets, Smart TV 2008

7. MS-DOS
Microsoftwith IBM1981

8. Windows
MicrosoftUsedinPC 1985

9. Windows Phone
MicrosoftUsedinsmartphones 2010

10. NetWare
NovellInc.UsedinPCasnetwork OSReplacedbyOpen EnterpriseServer 1983

11. BlackBerry OS
BlackBerry Limited Usedin BlackBerry Smartphones 1999

12. Symbian OS
SymbianLtd. Usedin MobilesByNokia, Samsung,Motorola,SonyEricsson, etc. 1998

13. Firefox OS
Mozillaandexternalcontributors2013

14. Unix
BellLabs 1969

15. Fedora
Fedora supportedcommunity &RedHatUsedinPC, Servers&Cloudservices 2003

16. Ubuntu
Canonical Ltd., Ubuntucommunity UsedinPC&EnterpriseServers 2004

17. CentOS
TheCentOSproject&RedHat 2004

18. SUBSCRIBE