Your question isn't clear, so I'm not sure which info you need. Windows 8 is the most recent version, and (like all versions) is sold in different "models" or maybe they're called "editions" (not sure of the term) and each edition has more (or just different) features added to the basic edition. For example, Windows 8 is the basic edition, then there's Windows 8 Pro, Windows 8 Enterprise, and Windows RT. The previous version was Windows 7, and had about 7different editions to choose from according to user needs. -- Here's a link listing ALL versions and their editions, with brief descriptions: http://en.m.wikipedia.org/wiki/Microsoft_Windows_versions and then click the link that is in blue that will "Search for List of Microsoft Windows versions".