Domain, Top Level Domain (TLD)
The indicator of the type of Web site or it location.
In the US common domains are: .com (commercial), .edu (education), .gov (government agency), .net (network related), .org (nonprofit and research organizations), .biz (business).
Outside the US, domains indicate country: ca (Canada), uk (United Kingdom), au (Australia), jp (Japan), fr (France), it (Italy), etc.