What does Windows 7 mean?

First, what does Windows7 mean?
Windows 7 is an operating system developed by Microsoft Corporation (Microsoft), the core version number is Windows NT 6.1. Windows 7 is available for home and business work environments, laptops, tablets, multimedia centers, and more. On July 14, 2009, Windows 7 RTM (Build 7600.16385) was officially launched. On October 22, 2009, Microsoft officially released Windows 7 in the United States. Windows 7 also released the server version —— Windows Server 2008 R2. On the morning of February 23, 2011, Microsoft officially released the Windows 7 upgrade patch — — Windows 7 SP1 (Build7601.17514.101119-1850) for the mass user. Also included is the Windows Server 2008 R2 SP1 upgrade patch.
Second, Windows version
In the market, Windows7 has many versions, which are divided into: Windows7 Simple Edition, Windows7 Home Basic Edition, Windows7 Home Premium Edition, Windows7 Professional Edition, Windows7 Enterprise Edition, Windows7 Ultimate Edition, Windows 7 Ballmer signature version. These versions have different styles and different prices. For details, please refer to the official website of Windows.