A domain name is an identification label to define a realm of administrative autonomy, authority, or control in the Internet, based on the Domain Name System (DNS).
Domain names are used in various networking contexts and
application-specific naming and addressing purposes. A prominent
example are the top-level Internet domains (TLDs) com, net and org. The approved but still pending addition of Unrestricted TLDs
are private TLD names that would allow organizations to use their own
name in place of the .com or .net TLD. For example. a company like
"Wigets" might have the .wigets domain and use services.wigets or
bargins.wigets rather than bargins.wigets.com.[1]
Below these top-level domains in the DNS hierarchy are the
second-level and third-level domain names that are open for reservation
and registration by end-users that wish to connect local area networks
to the Internet, run web sites, or create other publicly accessible
Internet resources. The registration of these domain names is usually
administered by domain name registrars who sell their services to the public.