What is a DOMAIN Name ?

domain name 

is a label that identifies a network domain (connected to Internet): a distinct group of computers under a central administration or authority.

Within the Internet, 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 used in various networking contexts and for 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. In 2017, over 330 million domain names had been registered by companies and individuals.

Domain names are organized in subordinate levels (subdomains) of the DNS root domain, that is nameless. The first-level set of domain names are the TOP-Level Domains (or TLDs), including the generic TOP-Level Domains (gTLDs), such as the prominent domains like for example: .COM, .INFO.NET, .ORG,and .EDU, and the country code top-level domains (ccTLDs) known also as: the Domain's extension. Just below those TOP-Level domains in the DNS hierarchy, are the second-level and third-level domain names that are typically opened for reservation by end-users who wish to connect local area networks to the Internet (World-Wide-Web), create other publicly accessible Internet resources or run various web sites.

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