United States extensions
Remember sites registered in the US have no geographical extensions.
.edu is an educational institution eg: http://www.wisc.edu/ Wisconsin university
.com is any company eg: http://www.amazon.com/ Amazon the Internet company
.org is an organisation (perhaps non-profit) eg: http://www.openoffice.org/ the organisation developing Open Office, the free office software suite.
.gov is a Government agency eg: http://www.irs.gov/ Internal Revenue Service
.mil is a military institution eg: http://www.navy.mil/ the US Navy
.net is used by network providers eg: http://www.discountasp.net/ an Internet hosting company
There are several others and some in the pipeline such as .info and .biz which will be used for commercial purposes.
Not all countries use these descriptive extensions. Germany and France, for example, only have the country extension. Thus we saw:
http://www.amazon.de/ for Germany and http://www.amazon.fr/ for France.
Another point to remember is that there is no requirement to register your site under its country of origin. Some British organisations use the US extensions of .com or .org:
www.debenhams.com/ - the well-known retailer
www.rsc.org/ - the Royal Society of Chemistry
are just two examples.
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