.com is supposed to be commercial organizations but doesn't have to be.
.org is supposed for sites that don't fall in another category, but that isn't really enforced.
.gov is for US gov't sites only
.edu is for US education sites.
Here is a list of all of the top level domain names.
Ok the ppl gave a pretty good grasp on what it means, but something else is that .org is a nonprofeting orgenization.
ande every nation has its own like:
South Africa : co.za
UK = co.uk
USA = co.us
gov = government.
edu = education.
org = organization.
com = Idontreallyknowsoimgoingtosay; 'Commercial' withconfidence& maybenobodywillnoticeimwrong. :D
they all mean different titles..i think.com is like comercial or business...and .edu is for educational stuff and .gov is for goverment websites