difference between XMPP servername and XMPP servicename?

Question

In Smack API, there is a configuration class for connection, described at this page

ConnectionConfiguration

I am confused about the distinction between service n

Answer 1

• myhost: service name (or XMPP domain)
• mybox.mydomain.com: hostname and servername.

You can host an XMPP domain over any host, provided that you set the SRV records right in the DNS or if the client specifies to which host it is supposed to connect (like email).