The Domain Naming System (DNS) is a service that resolves host names to IP addresses. These can be names of computers within an internal network or names of computers on the Internet. Clients send name resolution requests to a DNS server, and the DNS server responds with the IP address. The client computer then uses the returned IP address as the destination IP address for data traffic.
DNS is essential on a Microsoft domain. Active Directory requires DNS to locate servers running specific services, such as domain controllers.
