A domain name is an identification string (like .net, or, or 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) like .us. Below these top-level domains in the DNS hierarchy are the second-level (like and third-level domain (like 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 (like e-mail) or run web sites. The registration of these domain names is usually administered by domain name registrars (like ourselves) who sell their services to the public.

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