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Web Site: www.PcTechStream.com. Domain Name System (DNS) is a system for naming computers and network services that is organized into a hierarchy of domains. DNS naming is used in TCP networks, such as the Internet, to locate computers and services with user-friendly names. When a user enters a DNS name in an application, DNS services can resolve the name to other information that is associated with the name, such as an IP address. For example, most users prefer a friendly name, such as corp.contoso.com, to locate a computer, such as a mail server or Web server, on a network. A friendly name can be easier to learn and remember. However, computers communicate over a network by using numeric addresses. To make the use of network resources easier, name systems such as DNS provide a way to map the user-friendly name for a computer or service to its numeric address.