In this video, you will learn about Active Directory Components. 

AD Objects: Users and Computer in an Active Directory

Active Directory: AD is a windows server role.

Domain Server: AD installed server is known as Domain controller.

Domain: Logical group of network objects like users and computers

Tree: A tree is a collection of one or more domain

Forest: A forest is made of one or more domain and domain tree

Schema: determine what kind of objects can be stored in the database and attributes of these objects.

Trust: Trust enable you to grant access to resources to users, groups and computers across entities. 

Global Catalog Server: GB is an index, holds a full writable copy of objects in its host domain and partial copy of objects in other domains in the same forest