This document provides an introduction and objectives for a course on installing and configuring Windows Server 2012. It defines key terms like Active Directory, which is a centralized database that stores information about network objects and provides management; Domain Controller, which runs Active Directory services and replicates the directory database; Domain, which is a logical group of Windows computers that share a directory; and Forest, which can include multiple connected domains. The document explains that user logon requests are authenticated by domain controllers using the Active Directory database.