What is the difference between all these domain extensions?
When the Internet was first created by the US Department of Defense Advanced Research Projects Agency (ARPA) the only domain extensions were .gov (for US government sites), .edu (for educational institutions), and .mil (for US military sites). When the Internet was opened up to commercial and other users in the late 1980’s the .com (for commercial sites), .org (for organization sites), and .net (for network related sites) were created. Additional information on these and other “generic” domains can be found here. As the Internet and the World Wide Web has spread around the planet, the “non-generic” two letter country domain extensions were added. (For example, the BBC world news site is news.bbc.co.uk where UK stands for United Kingdom).