When referring to an operating system, Windows is an operating environment created by Microsoft that provides an interface, known as a Graphical User Interface (GUI), for computers. Windows eliminates the need to memorize commands for the command line (MS-DOS) by using a mouse to navigate through menus, dialog boxes, buttons, tabs, and icons. If you are using a PC (IBM) computer you are most likely using a version of Windows. If you are on an Apple computer you are using macOS.
Microsoft Windows was first introduced with version 1.0 on November 10, 1983. Since its release, there have been over a dozen versions of Windows. The most current version of Windows for end users is Windows 10.