Windows 10

Windows 10 is a personal computer operating system released by Microsoft as part of the Windows NT family of operating systems. To encourage its adoption, Microsoft announced that during its first year of availability, The Windows 10 would be made available free of charge to users of genuine copies of eligible editions of Windows 7 or Windows 8.1.

Removed features
Windows Media Center is long gone.

The OneDrive built-in sync client, which was introduced in Windows 8.1, no longer supports offline placeholders for online-only files in Windows 10.

Web browsers can no longer set themselves as a user's default without further intervention.

The MSN Food & Drink, MSN Health & Fitness, and MSN Travel apps are gone,

The option to select various methods for downloading Windows Updates (or ignoring them completely) was removed unless you are using Windows 10 Pro, Enterprise, or Education

The Microsoft Hazel voice is removed by default on then U.S. version, but can still be downloaded. Microsoft David and Microsoft Zira remain. However, a new voice named Microsoft Mark is included in Windows 10.

Windows Journal is gone but can be reinstalled.

3D Builder app. But it can be downloaded from the Windows Store.

Paint has been removed but can be downloaded from the Store. However, unlike previous versions, this version requires an Microsoft Account to download.

Use on my computers
It is used on TouchScreen

It will also be used on Red Dell as well.