A - Definitions
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A
active directory
Active Directory (AD) is Microsoft's proprietary directory service.
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Active Directory domain (AD domain)
An Active Directory domain (AD domain) is a collection of objects within a Microsoft Active Directory network.
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Active Directory forest (AD forest)
An Active Directory forest is the highest level of organization within Active Directory.
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Active Directory functional levels
Active Directory functional levels are controls that specify which advanced Active Directory domain features can be used in an enterprise domain.
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Active Directory tree
An Active Directory (AD) tree is a collection of domains within a Microsoft Active Directory network.
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Azure DevOps
Azure DevOps -- rebranded from Visual Studio Team Services (VSTS) in 2018 -- is a software-as-a service (SaaS) platform from Microsoft designed to provide a comprehensive toolchain for developing and deploying software projects.