What is Windows and types of windows operating system?

Microsoft Windows is a line of operating systems. The types are (In order of Release): Windows 1 Windows 2 Windows 2.1 Windows 3 Windows NT 3.1 Windows NT 3.5 Windows NT 3.51 Windows 95 Windows NT 4.0 Windows 98 Windows 98 SE Windows 2000 Windows ME Windows XP Windows Server 2003 Windows Vista Windows Home Server Windows Server 2008 Windows 7 (coming out later this year) I really hope this answered your question.