Take the tour ×  I've been reading on AmazonWS that you use
cname to use their webservices. Is CNAME when i have a file like
this sarah.example.com/image/2001.jpg and then it really is at
blablabla.com/mybucket/sarah/image/2001.jpg ? but the web user
doesnt know this? he sees the url adress as in example.com?
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CNAME is used in DNS Name Resolution It simply tells the
resolver to use the IP of another Domain Name that is already
defined. It is nothing more as an alias, see also Justice's
answer and the definition.  But it is not exchanged in the URL,
the CNAME record is only used to lookup the IP of
sarah.example.com, and the original url is then used.  In your
example it would be:  When the client is requesting
http://sarah.example.com/image/2001.jpg, he first looks up the
IP for sarah.example.com. The client asks a nameserver, an