A top-level domain (TLD) is the last part of an
Internet domain name; that is, the letters which follow the final dot of any domain name. For example, in the domain name www.example.com, the top-level domain is
com (or COM, as domain names are not
case-sensitive).The
Internet Assigned Numbers Authority (IANA) currently classifies top-level domains into three types:
country code top-level domains (ccTLD): Used by a
country or a
dependent territory. It is two letters long, for example
.us for the
United States.
generic top-level domains (gTLD): Used (at least in theory) by a particular class of organizations (for example,
.com for commercial organizations). It is three or more letters long. Most gTLDs are available for use worldwide, but for historical reasons
.mil (
military) and
.gov (
governmental) are restricted to use by the respective
U.S. authorities. gTLDs are subclassified into
sponsored top-level domains (sTLD), e.g. .aero, .coop and .museum, and
unsponsored top-level domains (uTLD), e.g. .biz, .info, .name and .pro.infrastructure top-level domains (iTLD): The top-level domain
.arpa is the only confirmed one.
.root has been known to exist without reason.
See more at Wikipedia.org...
TOP LEVEL DOMAIN. TLD
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