Like users, computers in a domain will have an account established for them. Their account can be seen in AD Users and Computers and viewed or modified there. What if you were going to add a new group of people in a new department? Each new person needs a user account and their computer should have an account as well in your domain. How you would set up the accounts in AD? (There is no one right way.) Consider things like using containers in Active Directory, GPO's, and access to each of the new computers.