Windows Server is a brand name for a group of server operating systems released by Microsoft. It includes all Windows operating systems that are branded “Windows Server”, but not any other Microsoft product. The first Windows server edition to be released under that brand was Windows Server 2003. However, the first server edition of Windows was Windows NT 3.1 Advanced Server, followed by Windows NT 3.5 Server, Windows NT 4.0 Server, and Windows 2000 Server; the latter was the first server edition to include Active Directory, DNS Server, DHCP Server, Group Policy, as well as many other popular features.
Windows Server 2016 includes the industryleading, active detection capabilities of Windows Defender to block known malware. Windows Defender works hand-in-hand with Device Guard and Control Flow Guard to prevent malicious code of any kind from being installed on your servers. It is turned on by default – the administrator does not need to take any action for it to start working. Windows Defender is also optimized to support the various server roles in Windows Server