A network is created to group computers and other objects into a common ground to share their means. The connected computers provide resources, such as files, folders, (local) printers, DVD players, that other computers can take advantage of. Besides the computers, peripherals such as printers, projectors, fax machines, etc, are made part of the network and shared so their use can be as transparent as possible. The computers, peripherals, users, and other resources that are part of a network are also called objects. The interaction and usefulness of the objects that are part of a network is mainly taken care of by people called users.
Because there can be so many objects in a network, they should be better organized to be able to locate and manage them. To make this possible, the objects are created as a list. The first or top item of the tree is referred to as the root. This main list contains items called nodes. Each main node of the list is considered a category of items. A category can contain its own internal categories also called nodes:
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