A domain name is described as an identification string that characterizes a field of administrative autonomy, authority, or operation within the Internet. Domain names are employed in several networking contexts as well as for application-specific naming and addressing purposes. A domain name distinguishes a network domain or it constitutes an Internet Protocol (IP) resource. A personal computer utilized to access the Internet, a server computer hosting a website, the website itself, or any other service conducted via the Internet could be IP resources.
The Domain Name System (DNS) structures the domain names based on its operations and regulations.
In the DNS, any name listed in the system is a domain name. These domain names are arranged in subordinate levels (subdomains) of the DNS root domain which is not identified by any name. The top-level domains (TLDs) such as the generic top-level domains (gTLDs), the prominent domains .com, .info, .net, .edu, and .org, and the country code top-level domains (ccTLDs) are the first-level set of domain names. The second-level and third-level domain names are generally accessible for reservation by end-users who want to connect local area networks to the Internet, make other publicly accessible Internet resources, or manage web sites.
The domain name registrars, persons who market their services to the public, manage the registration of these domain names.
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A fully qualified domain name (FQDN) is described as a domain name that is entirely defined with all labels in the hierarchy of the DNS and with no omission of parts. An FQDN typically ends in a dot (.) to signify the top of the DNS tree. All labels in the Domain Name System are case-insensitive and could be lettered in any desired capitalization method yet almost all domain names are written in lowercase in technical settings.
A list of 330.6 million domain names has been recorded in 2017.