According to the Indiana University Knowledge Base, a local area network domain is defined as a sub-network that is made up of servers and clients, each of which are controlled by a centralized database. User approval is obtained through a central server or a domain controller. The term "domain" can refer to descriptors for Internet sites, which is a site's web address, or to LAN sub-networks.
The IU Knowledge Base further explains that a domain is included in each website address, network address and email address. For example, the site says that the domain in the Web address www.indiana.edu/people/address.shtml is "indiana." The directory in the domain is "people," and the file in directory is ".shtml." A domain is obtained by choosing and buying one from a domain registrar.
Domains on the Internet are categorized by levels. Top-level domains or TLDs include .com, .net, .edu and .org. CcTLDs represent top-level domains of countries, while gTLDs are generic top-level domains. Domain names are governed by the Internet Corporation for Assigned Names and Numbers, which oversees the creation of TLDs as well as their distribution.
Domain name servers maintain a connection between domain names and IP addresses. The DNS system is used by computers to transmit information online.