A domain TLD (top-level domain) which sometimes also referred as domain name extension is the last part of a domain name; that is the letters which follow the final dot of any domain name. For example, in the domain name www.DomaisVilla.com, the top-level domain is com.
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 domain TLD 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.
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