Original: Speaking about Windows 7 on October 16, 2008, Microsoft CEO Steve Ballmer confirmed compatibility between Vista and Windows 7, indicating that Windows 7 would be a refined version of Windows Vista.
Simplified: Windows 7 is the newest version of Microsoft Windows, which is an operating system for computers. Microsoft says Windows 7 is faster, more reliable and more compatible, and that it is a refinement of the previous version named Windows Vista.