Domain
A domain is an area of a network managed by a single authentication database
An Active Directory domain is a logical grouping of AD objects on a network
Domain Controller (DC)
It is a server that authenticates user identities and authorized their access to resources
Domain Computer
A computer that is registered with a central authentication database
It would be an AD Object
AD Object
An AD Object is the basic element of Active Directory
Users, Groups, Printers, Computers, Shared Folders are all AD Objects
Group Policy Object (GPO)
A virtual collection of policy settings
Controls the access permissions of AD Objects
Organization Unit (OU)
A subdivision within an AD into which we can place users, groups, computers and other OUs
Directory Service
Provides the methods for storing directory data and making this data available to network administrators
Directory services run on the Domain Controller (DC)