This document discusses the history and evolution of the Microsoft Windows operating system from its origins in the 1980s to the present day. It provides an overview of key Windows releases including Windows 1.0, Windows 95, Windows XP, Windows 7, Windows 8, and Windows 10. Each new release brought improvements to graphics, usability, security and support for emerging technologies. The document also briefly mentions early versions of Windows Mobile and precursors like MS-DOS. Overall it traces the development of Windows from a command-line OS to the graphical, ubiquitous platform it is today.