What is the term for a collection of computers that share a common directory database in a Microsoft Windows network?

In a Microsoft Windows network, the term for a collection of computers that share a common directory database is "Domain." A domain is a centralized framework that allows multiple devices to be managed and authenticated using a shared directory service, specifically Active Directory in a Windows environment. This architecture enables centralized administration of user accounts, security policies, and resource allocation, providing a unified approach to managing networked computers and services.

This is different from the other terms. A network refers more generally to any interconnection of computers but does not imply a shared directory. A workgroup is a decentralized model where each computer is managed independently without a common directory, thus lacking the centralized control and security features that a domain provides. A subnetwork refers to a smaller network within a larger network, typically defined in terms of IP addressing, rather than the administrative structure of the network.

The defining characteristics of a domain—such as the presence of a centralized directory database and the associated management capabilities—make it an essential concept in Windows networking, clearly distinguishing it from other networking structures.