Windows Operating System is a product of Microsoft which is basically a graphical interface environment. Today Windows OS dominates more than 90% of the market share in the desktop category. Mostly this OS is used in laptops and desktops for working purposes. Now this operating system can be used seamlessly on smartphones as well.
Windows 1.0 was officially released in November 1985. It was not a complete operating system, but an advanced extension of the MS-DOS software. It could not grab the required attention and was unable to make any significant impact. The components that it included were Notepad, Control Panel, Write, Calendar, Clock and Calculator. Soon Windows 2.1 was released. This was released in two different versions, one being Windows/286 and the other being Windows/386.