Hello Friends so First of all Your Pc is useless Until you have a Os in that . And There are Linux Os and mac Os which is offered by apple now you can use it in any Pc and windows by Microsoft
Windows is the most used and popular Os
There is Different version of windows 10 like - HOME, Pro, Enterprise, Core
But there are also many versions in windows Os and latest is windows 10 it has higher user percentage
And its interference is good and simple and modern in its way windows start has been redefined by giving a mix look of windows 7 and windows 8 start now its more good looking a before and
its has most of things Pre loaded as browser music player and Skype and twitter and some games like candy crush and there is Windows store where you can download some apps for windows
And there is XBOX LIVE option Pre loaded
But there are some little bugs and you feel if you don’t buy a orignal product or you download it like start will be no stable and after some time it will ask you to activate windows even if you activated before sometime But Anyway
Its The Most Recommended Product in Field of Operating System