How to use Rsync both in Server and Client

Dear All,

I've read in this article : http://serverfault.com/questions/68270/speeding-up-rsync-over-smb

That :

The "right way" to use rsync is to run the rsync server on one machine and the rsync client on the other.

Could somebody explain about this to me? How to do that? Running rsync server and rsync client? Is it simply run rsync service on both server and client? Or there are special installer for rsync client and rsync server?

Please advise. Thank you.
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Solution: How to use Rsync both in Server and Client