A domain name is an identification string that defines a realm of administrative autonomy, authority, or control in the Internet. Domain names are formed by the rules and procedures of the Domain Name System (DNS).

Domain names are used in various networking contexts and application-specific naming and addressing purposes. In general, a domain name represents an Internet Protocol (IP) resource, such as a personal computer used to access the Internet, a server computer hosting a web site, or the web site itself or any other service communicated via the Internet.

Domain names are organized in subordinate levels (subdomains) of the DNS root domain, which is nameless. The first-level set of domain names are the top-level domains (TLDs), including the generic top-level domains (gTLDs), such as the prominent domains com, net and org, and the country code top-level domains (ccTLDs). Below these top-level domains in the DNS hierarchy are the second-level and third-level domain names that are typically open for reservation by end-users that wish to connect local area networks to the Internet, create other publicly accessible Internet resources or run web sites. The registration of these domain names is usually administered by domain name registrars who sell their services to the public.

Illustration of the different levels of a domain name.

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Domain Name Registrar (Domain Name Registration, Names ...
Domain Name Registrar. Includes Domain Names, Domain Registration ... info. from computers anywhere on the Internet ... Domain Name Registrar; Domain Trainer; Domain ing; Domain z
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Nbtstat (Address, Host, Network, Windows) @ DomainTrainer.com
... computers. . nbtstat. ... Nbtstat. NetBIOS Windows Internet ... internet/domain_names/disputed_domain_names/uniform_domain_name ... www.domaintrainer.com/domain_trainer ... domain ...
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www.domaintrainer.com
... www.domaintrainer.com/computers/internet/domain_names/disputed_domain_names/uniform_domain_name ... www.domaintrainer.com/domain_trainer/ http://www.domaintrainer.com/domain ...
www.domaintrainer.com/urllist.txt

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• Alternate Domain Names@ (3)
• DNS Protocol@ (88)
• Official TLD Registries (160)

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• Disputed Domain Names (251)
• Globalization@ (11)
• Opinions (2)
• Resources (117)
• Software@ (17)

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• For Sale or Auction (185)
• Name Search (52)
• Parking (0)
• Registrars (223)
• Unregistered Domain Lists (3)

• Domains Reregistered for Distribution of Unrelated Content - A Case Study of "Tina's Free Live Webcam"
  cyber.law.harvard.edu
  Research documenting 4525 domains registered by 'Tina's Free Live Webcam.' Each domain was previously used by another registrant, and Tina seems to have specifically sought to re-register the domains as they became available. Includes a discussion of the scope of this problem, policy implications, and possible solutions.
• Public Suffix List
  publicsuffix.org
  An initiative of the Mozilla Foundation to record domain name suffices such as ".com" or ".co.uk" under which sub-domains for different entities are registrable. Includes FAQs, the list file, and instructions for registrars to submit changes.
• ICANN
  icann.org
  The non-profit corporation responsible for IP address allocation, protocol parameter assignment, as well as domain name and root server system management functions.