I am confused about domain names (I think) I call these things, i.e. names you can buy, 'domain names' bbc.co.uk google.com I call these things, i.e. extensions of names 'host names' www.bbc.co.uk mail.yahoo.com arts.mit.edu hello.there.example.com Is this naming scheme correct? Are there official definitions of these? In particular, what are each of the texts between the dots called (i.e. the name for "www", "bbc", "edu", "example")?