Windows 10 is the recent operating system launched by Microsoft corporation. One of the unique features of Windows 10 include Cortana.
It is a speech recognition software. It is awesome. But there are some corrections to be made. For example, we have to almost yell to get response. Sometimes it recognizes something wrong. Other than this, there is Action center(Notifications related to any issues) which is very helpful for maintenance.
I got it for free directly from Windows 8. I booked for Windows 10 when I was using Windows 8 and it got upgraded to Windows 10 recently. It is a bit slow compared to Windows 8. I guess it will get awesome reputation with time.