Active Directory (AD) is a directory service developed by Microsoft for Windows domain networks. It is included in most Windows Server operating systems as a set of processes and services. Initially, Active Directory was only in charge of centralized domain management.

Acronym for Azure Active Directory. It is the Identity as a service solution in Azure. Acronym for Active Directory Domain Services. Microsoft's directory service product.

3. Monitor Active Directory with Premium Tools. Active Directory is the heart of the network, if it stops beating then everything else dies. I know FREE tools are great (I use plenty of them)...