server is a powerful computer in a
network which works as a server for
a unique name. Its services are dedicated
to that particular domain. So mostly
dedicated server is used by one organization.
The hosting company provides you
with an entire hosting setup including
your own server hardware that only
you can use. This means a much faster
loading time for your site because
the entire computer is "dedicated"
to running the server software.
If you are looking for a server then
consider following things.