What is the difference between sites that end in .com, .org, .net and .edu?
The various suffixes in domain names are meant to designate the function of the domain. For example, .com addresses are used for both commercial and general sites; .org is used for non-profits; .net for companies that perform network-related work; and .edu for educational institutions. Other suffixes include .gov (government) and .mil (military), as well as designations for various countries (for example, .ru for Russia and .ca for Canada).