domain name system - What's the difference between FQDNs and Hostnames

First of all, I wanna say that I know how DNS Servers work
and also I know about the records in a DNS Zone
File!

I'm not an expert but I have
some knowledge about them. I'm confused! why?! because I don't know what's the exact
difference between hostnames and FQDNs.

I know
that some thing like my.example.com. is a FQDN. somebody told me it's a FQDN because of
the existance of "dot" at the end of it.

I think
the final dot at the end of it reffers to the root dns servers in the world,
right?

Is my.example.com a hostname? (note that
it's doesn't have any final dots!)

maybe "my" is
the hostname?!

Actually i'm confused!

What's the difference between a hostname and a
FQDN, guys?!

Sorry, My english isn't very good.
excuse me if I made a mistake.

Thanks in
advance.

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