What is the canonical name for domain names with extra parts?

Posted by ConfusedFromIreland on Server Fault See other posts from Server Fault or by ConfusedFromIreland
Published on 2011-01-13T16:50:40Z Indexed on 2011/01/13 16:54 UTC
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dns

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terminology

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")?

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