Active directory is an even system to the Netware tree that serves to share resources in a set of dominions. For it uses a common system of resolution of names (DNS) and a common catalogue that it contains a complete retort of all the objects of directory of the dominion in which lodges besides a partial replica of all the objects of directory of each dominion of the forest.
In addition it contains information on all the objects of all the dominions of the forest
What is an object?
It is any thing that has organization in the directory. It can be a program, a user, a computer, a printer.
What is a domain?
It is a set of users and equipment that is sharing the same resources of network, under a same administration
What it is a tree?
It is a set of dominions with confidence relations to each other that share resources, clients and a system of resolution of names.
What is a forest?
It is a set of trees of dominion with confidence relations to each other