In the diagram below, we have an example of how Active Directory can be used to represent a network infrastructure. The top level of the diagram is the forest, which is represented as a rectangle. The forest is made up of multiple trees $($the circles inside the rectangle$)$ each of which corresponds to one of the domains within the forest. The lines inside the rectangle indicate the parent$-$child relationship. Within each domain, you may have organizational units, which are smaller rectangles that help you organize and manage things like users, groups, and computers. This hierarchical structure makes it easier to manage and delegate tasks within your network environment, and it also makes it easier to use Active Directory services to manage and authenticate users and groups.