Domain
A domain name is a string that identifies a realm of administrative autonomy, authority or control within the Internet. Domain names are used in various networking contexts and for application-specific naming and addressing purposes. In general, a domain name identifies a network domain or an Internet Protocol (IP) resource, such as a personal computer used to access the Internet, or a server computer. Domain names are often used to identify services provided through the Internet, such as websites and email services. As of 2017, 330.6 million domain names had been registered.[1]
Domain names are formed by the rules and procedures of the Domain Name System (DNS). Any name registered in the DNS is a domain name. 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, info, net, edu, 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 who wish to connect local area networks to the Internet, create other pub
licly accessible Internet resources or run web sites.
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