top-level domain
a.k.a. TLD, gTLD, generic top-level domain, strings, domain name ending, domain names In the Domain Name System (DNS) hierarchy, it is the highest level under the root. In a domain name, it is that portion that appears furthest to the right; for example, the "com" in www.netlingo.com.
Two letter domains, such as .uk, .de and .jp (for example), are called "country code top-level domains" (ccTLDs) and correspond to a country, territory, or other geographic location. The rules and policies for registering domain names in the ccTLDs vary significantly and some are reserved for use by citizens of the corresponding country.
The official list of all top-level domains is maintained by the Internet Assigned Numbers Authority (IANA). See also these definitions: .com, .edu, .gov, .net, .org, country codes.
Historical perspective: From March 1985 to March 2015, more than 284 million domain names were registered and as of March 2015, there are more than +800 different domain endings to choose from. Below is an infographic of all the domain names to choose from - we realize it doesn't fit, see the full version here: http://blog.europeandomaincentre.com/infographic-know-domain-endings-com-whatever/
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