Check the 2nd
Microsoft Windows OS:
Windows is a personal computer operating system from Microsoft that, together with some commonly used business applications such as Microsoft Word and Excel, has become a de facto "standard" for individual users in most corporations as well as in most homes.
The original 1985 version of Windows introduced to home and business PC users many of the graphical user interface (GUI) ideas that were developed at an experimental lab at Xerox and introduced commercially by Apple's Lisa and Macintosh computers.
Some of the well-known versions of Windows have included:
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Google Android OS:
Android is a Linux-based operating system designed primarily for touchscreen mobile devices such as smartphones and tablet computers. Initially developed by Android, Inc., which Google backed financially and later bought in 2005, Android was unveiled in 2007 along with the founding of the Open Handset Alliance: a consortium of hardware, software, and telecommunication companies devoted to advancing open standards for mobile devices. The first Android-powered phone was sold in October 2008.
1.5.X Cupcake [CC]
2.3.X GingerBread [GB]
3.X HoneyComb [HC]
4.0.X Ice Cream Sandwich [ICS]
4.2.X Jelly Bean [JB]
4.4.X KitKat [KK]
5.X Lollipop [L]
6.X Marshmallow [M]