Microsoft Windows, or simply Windows, is a metafamily of graphical operating systems developed, marketed, and sold by Microsoft.
Windows Store is an app store and online music store for Microsoft Windows, starting with Windows 8 and Windows Server 2012. It is the primary means of distributing Universal Windows Platform apps. Both free and paid apps can be distributed through Windows Store, with paid apps ranging in cost from US$0.99 to $999.99. Windows Store was first made available with the Windows 8 Consumer Preview on February 29, 2012. Later in 2015, Windows Phone Store, Xbox Video and Xbox Music stores were merged into Windows Store.
As with other similar platforms, such as the Mac App Store and Google Play, Windows Store is curated and apps must be certified for compatibility and content. With all app sales, Microsoft takes 30% of the sale price According to Microsoft, as of September 28, 2015, there are over 669,000 apps available on the Windows Store, which includes apps for Windows NT, Windows Phone, and Universal apps, which work on both platforms. Games, Entertainment, Books and Reference, and Education are the largest categories by number of apps and the majority of the app developers have 1 app.