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What's the difference between .com, .net and .org? The letters after the "dot" in a Web address are the domain extension. The domain extension may tell you about a site's purpose or locale. For example, sites with a .com extension are often commercial sites. There are domain extensions for countries, such as .it for Italy, .dz for Algeria, .us for the United States, .to for Tonga. There are many other extensions now, including .biz, .tv and others, but the ones we see most often are the .com, .net, and .org.
The original extensions were meant to indicate a Web address was being used for a business (.com), a charity or non-profit organization (.org), or for an Internet technology company (.net). As the World Wide Web grew, however, companies and individuals started to register their domains with all the extensions. Currently, .com, .net, and .org domain extensions are universally accepted for any type of Web address.