DNS recognizes computers by alphanumeric names and translates the names to the numerical IP addresses recognized by computers and networking equipment. DNS resolves the computer names to the IP addresses.
DNS is installed as a role in Windows Server 2008. It can be installed with Server Manager and with the DNS Server command from the command prompt. The preferred way is to install the DNS Server Role when Active Directory Domain Services is installed, if you want to integrate the DNS domain namespace with the AD DS domain namespace. In addition, Server Core can act as a DNS Server.